Exact terms
Glossary
The words the method uses, as the founder uses them.
- 42-Inch Age-Group World Record
- The founder's 15-year-old broke the world record in his age group over 42-inch hurdles.Sources
GLOSS - 7-14-21
- Founder-specific pace-count drill underlying the spacing progression; counts use Bazz's own paces and are not literal universal-foot measurements.Sources
GLOSS - 80/20 Drill-Sprint Transition
- Begin the season at approximately 80% drills and 20% sprinting, then reverse that relationship by the end of the season.Sources
GLOSS - A-Walks
- Moderately slow frontside drill, about 1.0 to 1.2 seconds per step, with a slight beat at the top to show the full shape and angles.Sources
WALK· b4 - ABCs
- Last drill of the warmup and first split measurement: block starts over hurdles at 4-, 3- and 2-foot discounts.Sources
WALK· b11 - Above the Lead Knee
- The hurdler is positioned above the lead knee at H1 and every subsequent hurdle so the athlete can step down over the hurdle.Sources
GLOSS - Accumulated Flight Time
- Sum of takeoff-to-touchdown intervals across the hurdle race, proposed as a race-quality measure.Sources
GLOSS - Accumulated Ground-Contact Time
- Sum of ground-contact intervals across the hurdle race, proposed as a race-quality measure.Sources
GLOSS - Accuracy
- Correct and repeatable execution of the required composition.Sources
GLOSS - Accurate Hurdling
- Measure and rehearse the athlete's ideal step, takeoff, and touchdown locations after stiffness, coordination, rhythm, and other prerequisites are installed.Sources
GLOSS - Aggression as Athlete Agency
- “Find more aggression” asks the athlete to assume responsibility, author the next repetition, express oneself, and go for it.Sources
GLOSS - AOH
- Art of Hurdling, attributed by Bazz to Steve McGill as a primary source for hurdle art, science, physical and mental concepts, drills, philosophies, and shapes.Sources
GLOSS - Back Kick Kills Speed
- Founder anti-pattern statement from the sprint drill section; frontside mechanics increase stiffness and frequency.Sources
WALK· b4 - Backing-Band Coaching Model
- The coach keeps the beat, sets the vibe, and supplies structure and support; the athlete is the lead singer and lead guitarist with room for the solo.Sources
GLOSS - Big Four
- The first four steps of the hurdle race, used to create large opening splits, matched shin angles, straight-line limb action, forceful backward track strikes, and a measured step-four position.Sources
GLOSS - Big Four Dribble into Tyson
- Transition from the first four acceleration steps into progressively shorter, quicker approach steps with low, quick hands, followed by the Tyson arm action through H1.Sources
GLOSS - Biofreeze Pre-Race Protocol
- Founder practice of lathering Biofreeze from ankle to hip before big races so reduced leg sensation lowers perceived effort.Sources
GLOSS - Block Start Warm-Up
- Flisk, double knee, then two-step and four-step starts to measured marks, aiming at negative shin angles.Sources
WALK· b10 - BOIL A FROG
- Capitalized founder concept for micro progressive overload: begin in an easy natural state and add difficulty in small increments so adaptation occurs without a disruptive psychological break. The literal frog story is uncertain family lore.Sources
GLOSS - Booms
- Switch drill: right foot down, switch in the air, left foot down, holding the freeze at the top of the shape about half a second.Sources
WALK· b4 - Bottom-Ups
- High-knee-like drill in which the athlete tries to pull the foot to the butt without the spike kicking back; the attempt supplies the impetus for the proper sprint motion.Sources
WALK· b4 - Bounce Down the Track
- Capitalized founder belief: use stiffness, hard down-and-back strike, and low ground-contact time to continue through the hurdle rhythm with a forward bouncy quality.Sources
GLOSS - Bounce, Do Not Vault
- Incorporate the hurdle through a quick reactive action rather than treating it as a separate vault, launch, or jump requiring extra barrier effort.Sources
GLOSS - Braking Step
- A foot strike ahead of center of mass that slows forward travel; explicitly prohibited in the founder model through hurdles one to three.Sources
GLOSS - Bring This to the Next Drill
- Coaching transfer command asking the athlete to carry technique, INTENT, rhythm, and smoothness from the current condition into the next one.Sources
GLOSS - Bring This to the Race
- Final transfer command asking the athlete to preserve the practice-built composition under race conditions.Sources
GLOSS - Build the Machine
- The founder's phrase for what sprint drills begin: preparation is over and practice proper has started.Sources
WALK· b3 - Caffeine Pre-Race Protocol
- Founder practice using caffeine before racing to reduce perceived effort in addition to its other effects.Sources
GLOSS - Chicken Paw
- Trail foot shape with toe pointing directly sideways and heel-to-toe line parallel with the ground.Sources
GLOSS - Chicken Wing
- Maximally bent heel-to-butt trail-leg shape used to coil the Getaway Step.Sources
GLOSS - Coaching Language as Performance Intervention
- The coach selects words, imagery, emotional voltage, and delivery to produce the required athlete response rather than merely describe the movement accurately.Sources
GLOSS - Colorful Language
- Forceful metaphor, profanity, exaggeration, or superhuman imagery used to create an emotional connection and unlock a physical response.Sources
GLOSS - Complete Effort Equation
- Discounted Electric quickness plus race specificity, overload, normalization, return contrast, perceived-effort reduction, and confidence.Sources
GLOSS - Compress, Expand, Recompress
- Reduce hurdle spacing to demand a faster cycle, restore wider spacing to test retained reaction, then compress or alter the setup again to create the next problem.Sources
GLOSS - Confidence Is the Number-One Coaching Job
- Founder tenet that the hurdle coach's primary responsibility is to build the athlete's confidence.Sources
GLOSS - Cooking
- The founder's word for a practice that is working: the entire warmup plus three to six working sets.Sources
WALK· b13 - Create the Problem
- Move fast enough within a designed hurdle constraint that the athlete's trained instincts must solve the coordination problem faster than conscious thought.Sources
GLOSS - Cut Step
- Abbreviated final ground contact before hurdle clearance: swing from the hip, dorsiflex immediately, retain a very slight knee bend, brace the leg, and punch down through a stiff hip, knee, and ankle.Sources
GLOSS - Dance Fast
- Execute the required hurdle shapes and rhythms through rapid, trained central-nervous-system switching so the complete race pattern is finished quicker.Sources
GLOSS - DHP
- Daniel's High Performance, a founder-named source for programming, season arc, macro planning, and overall athlete-development perspective.Sources
GLOSS - Discipline
- The founder's word for holding the up-DOWN shape; athletes are not allowed to lose their discipline of their shapes at any speed.Sources
WALK· b7 - Dorsiflexed Bounce
- Keep the foot dorsiflexed rather than toe-down in plantar flexion so the strike can remain stiff, quick, and directed down and back.Sources
GLOSS - Double Knee
- Block drill from Coach Kevin: knees down, hands far forward; going forces the athlete to pull the legs through fast or fall. Source of double knee panic.Sources
WALK· b10 - Double Knee Panic
- The reaction feeling every block start should carry: nothing moderate about a block start.Sources
WALK· b10 - Dribble
- The fast, low-handed motion after the Big Four that leads into the Mike Tyson; it resembles the lane line drill.
- Effective Strike
- A strike that propels the athlete down the track because it lands slightly behind the athlete at the proper angles; not a braking step.Sources
WALK· b6 - Electric Hurdles
- Create an urgent hurdle problem that demands an electric brain-to-nerve-to-muscle reaction beyond comfortable execution.Sources
GLOSS - Electric Overs
- The fast pass at each phase of 7-14-21: hurdle as fast as you can with as much speed as you can, do not crash, and keep the discipline of your shapes.Sources
WALK· b7 - Every Practice Gives Everything
- Low-close and wider or faster hurdling coexist in every practice; improvement is transfer between conditions, not permission to progress.Sources
GLOSS - Every Step Creates the Next Hurdle Problem
- Punch, Getaway, and Sprint contacts create the spatial pressure that allows the next abbreviated Through Step to solve the hurdle.Sources
GLOSS - Exposure Displacement
- Non-hurdling work consumes finite capacity that could otherwise support higher-value hurdle practice.Sources
GLOSS - Fast vs Quick
- Raw or isolated speed is distinct from being quickest through the complete hurdle race.Sources
GLOSS - Fence Demonstration
- Cycle the trail leg while leaning against a fence, then repeat upright, so the athlete directly feels the difference in difficulty.Sources
GLOSS - Fifty Rhythmic Steps
- The athlete seeks to complete approximately fifty rhythmic steps before the competitors.Sources
GLOSS - Fifty-Step Race Memory Model
- Rounded teaching model: the hurdle winner is the athlete who completes the approximately fifty required contacts fastest. Exact counts vary and remain unresolved.Sources
GLOSS - Find More Aggression
- Transfer responsibility and agency to the athlete, name an intentional experiment, commit to it on the next repetition, and use the result to select the next attempt.Sources
GLOSS - First Invariant Set
- Find more aggression; you can't be too aggressive; forward lean; hit the track as hard as you can; stiffness.Sources
GLOSS - First to Fifty
- The named Electric Hurdles race concept: the athlete who takes the fifty required steps fastest wins. Fifty is the memorable, useful coaching number; debating 49 versus 50 adds no value to the principle.Sources
GLOSS - Flisk
- Block drill: react to the full start command and just flinch out of the blocks to feel them.Sources
WALK· b10 - Foot Feel
- Theme of the no-hurdle passes: what it feels like to strike the track in an effective way.Sources
WALK· b6 - Forward Lean
- Technical invariant and positive target: tilt the hurdler forward to speed trail-leg return, reduce flight time, brace the core, increase stiffness, and constrain excess torso movement. Exact angles, race phases, and measured effects remain open.Sources
GLOSS - Founder Assertion
- Claim supplied by Bazz before independent corroboration.Sources
GLOSS - Founder Interview
- Capture Bazz's founder-held methodology before legacy documents constrain architecture.Sources
GLOSS - Founder Method
- Coaching method Bazz identifies as part of the system before reconciliation.Sources
GLOSS - Frontside Mechanics
- Theme of the sprint drill section: a bias for getting the limbs and hands out front, getting off the ground quickly so the foot never travels behind the body, and focusing on the front half of the foot.Sources
WALK· b4 - FTC
- Feed the Cats, a primary source for speed-based training, freshness over grinding, and timing every repetition.Sources
GLOSS - Fun, Freshness, and Injury Prevention
- The system seeks enjoyable practice, preserved athlete readiness, and reduced injury exposure alongside competitive improvement.Sources
GLOSS - Geometry, Accuracy, Temporal
- The founder's three evaluation domains: geometry is the shapes, accuracy is where the athlete takes off and touches down, temporal information is the timing.Sources
WALK· b11 - Getaway Step
- Trail-leg strike whose intent is to propel the athlete down and back away from the hurdle.Sources
GLOSS - Gorilla Starts
- Two-step, four-step and eight-step starts leaning over the front leg to work acceleration.Sources
WALK· b4 - Grand Holloways
- Fence drill: the trail leg cycles around a forward-facing hurdle clicked down 3 inches without the foot touching the ground.Sources
WALK· b5 - Heel to Butt
- Trail-leg cue, solved at the fence together with the chicken paw toe pointing to the side.Sources
WALK· b9 - Height Overload Sex Boundary
- Above-race-height exposure has been tested and proven in male hurdlers only; female hurdlers have gone to race height for a stretch, never above, while female experimentation remains open because the principle is the same.Sources
GLOSS - Hex-Bar Deadlift with No Negatives
- The founder's high-value weight-room movement: pull the hex-bar deadlift to the top, then drop the weight rather than lowering it through the negative.Sources
GLOSS - Hit the Track Before You Hit the Track
- Begin maximum-force intent before visible contact so the approaching foot does not wait for or passively fall onto the track.Sources
GLOSS - Hit-Cycle-Hit
- Fence drill: hit the track, use the reaction to pull up, over and through the hurdle, then hit the track again; one rep, allowed to settle before the next. Cue: heel to butt.
- Hot Hand
- Hurdling is treated like withdrawing a hand before it can be slapped: create urgency and react before comfort or conscious delay governs the response.Sources
GLOSS - Hurdle Count
- Every hurdle cleared in a workout counts against a cap; the founder's illustration is 50. The working sets are adjusted to what remains.Sources
WALK· b13 - Hurdle Race as Rhythmic Expression
- A hurdle race is one continuous rhythmic speed composition in which hurdles belong inside the rhythm rather than interrupt it.Sources
GLOSS - Hurdle Skill
- The learned perceptual, rhythmic, coordinative, and physical capability required to hurdle well.Sources
GLOSS - HURDLING
- Capitalized Stay Dangerous concept: one smooth, contiguous, clean motion from entering the cut step through finishing and exiting the getaway step; its elements may be analyzed but must not become separate executed motions.Sources
GLOSS - If It's to Be, It's Up to Me
- Execution belongs to the athlete performing the repetition.Sources
GLOSS - Immediate Trail-Foot Drop
- Begin lowering the trail foot the instant it clears the hurdle while the toe still points laterally; do not continue rising, travel level, or march fully to the front.Sources
GLOSS - Integrate, Do Not Conquer
- The hurdler incorporates each hurdle into a harmonious speed process rather than treating the barrier as an enemy to defeat.Sources
GLOSS - INTENT
- Capitalized system principle: name and mentally organize each step by the response it must produce.Sources
GLOSS - Irresponsible
- Deliberately reject the play-safe mindset and use designed constraints intense enough to demand faster instinctive adaptation.Sources
GLOSS - Jump-Rope Rhythm Ladder
- Progress from kindergarten extra bounce to Double Dutch, boxer wrist action, and advanced half-count rhythm to teach greater speed through smaller motion and greater stiffness.Sources
GLOSS - KOT
- Knees Over Toes, a primary source for body preparation, prehabilitation, resilience, and capacity for required hurdle shapes.Sources
GLOSS - Lane Line Drill
- Mentor-derived extreme compression drill using sideways movement across lane lines and rapid forefoot contacts over an imagined small barrier.Sources
GLOSS - Lead Leg Punchdown
- Conditional fence drill: lean forward, thigh to chest, heel high with a dorsiflexed lead leg, fall forward, catch on the fence, push back up. Done instead of kicking the fence, which the founder excludes.Sources
WALK· b5 - left-left
- Theme and measured unit of the 21s; the interval the founder measures across the clearance, paired with the Mike Tyson arm action.
- Low Close Hurdles
- Early-season constraint using very low, reduced-spacing hurdles to demand tap-dance timing and micro-motion; all executable spacing remains safety gated.Sources
GLOSS - Max Intent
- Full mental intention directed toward the specific output of a task, whether the task itself is high intensity or low intensity.Sources
GLOSS - Memory Game Model
- Failed matches reveal card locations; accumulated failures map the environment and make a later successful match possible.Sources
GLOSS - Mike Tyson
- The violent upper-body action as the athlete clears the first hurdle: two same-arm uppercuts that organize the force of clearance. Follows the dribble.
- Mini Tyson
- H1-to-H2 application of forceful contacts, forward shin angles, front-side mechanics, dribbling contacts, and Tyson-like arm action.Sources
GLOSS - Monkey Feet
- The founder's name for attaching a dumbbell to the foot and performing hip-flexor knee raises. A cable machine can produce the same action.Sources
GLOSS - No-Hurdle Drills
- Hurdle drills performed without hurdles after spiking up: cut step, lead leg and whole-cycle passes. Theme: foot feel.Sources
WALK· b6 - Normalize the Harder Task
- Repeatedly retain the desired movement under harder geometry until it feels familiar, then return to race or discounted conditions.Sources
GLOSS - North Pole Doctrine
- Formal capitalized Stay Dangerous psychological doctrine: name one positive destination that organizes direction, preparation, and exclusions so the athlete does not need a separate command for every wrong destination.Sources
GLOSS - On Top
- Founder-equivalent language for being above the lead knee at a hurdle.Sources
GLOSS - One-Step Overs
- The power pass at each phase of 7-14-21: get on and off the ground as fast as possible with good force heading in.
- Opportunity-Led Origin
- Stay Dangerous began from love of hurdling and a desire to improve before it was framed as a formal problem-solving system.Sources
GLOSS - Original Composition
- Stay Dangerous claims originality in the selection, exclusion, combination, sequence, practice rhythm, and athlete-specific translation of credited ingredients, not in the ingredients themselves.Sources
GLOSS - Perception of Effort
- Athlete's experienced difficulty of the hurdling task, treated as trainable through exposure contrast and other controlled micro improvements.Sources
GLOSS - Pitter-Patter
- Desired quick, economical, shuffling contact quality carried from close-spacing drills into the full hurdle race.Sources
GLOSS - Pole Vault
- Cardinal cut-step anti-pattern: take off too far away, lengthen the hip swing or reach, contact ahead of center of mass, and lever over the hurdle instead of traveling through it.Sources
GLOSS - Pop
- Positive coaching word for short, quick, efficient ground contacts associated with stiffness and Bounce Down the Track.Sources
GLOSS - Pop-Through
- The founder's best drill: jogging or marching up to the hurdle, punch the cut step back from about 4 feet, cycle over fast, hit hard on the far side.Sources
WALK· b9 - Pop-Throughs
- Drill family comprising Marching Pop-Throughs, Jogging Pop-Throughs, and Single Pop-Throughs; exact execution and intent remain open.Sources
GLOSS - Practice Ramp
- A sequenced practice flow in which activations, mobility, body preparation, and drill phases progressively prepare and construct specific parts of the hurdle race.Sources
GLOSS - Press the Gas Without Crashing
- Push hurdling speed to the edge that demands animal instinct while retaining the explicit boundary of not crashing.Sources
GLOSS - Productive Danger
- Create an urgent reaction problem at the athlete's current edge, call trained instinct into action, stop short of crashing, then recover before the next exposure.Sources
GLOSS - Productive Exposure Range
- The hurdle-practice range between insufficient exposure and excessive volume.Sources
GLOSS - Program Entry-Exit Pattern
- Athlete performance is compared before entering, while operating inside, and after leaving the methodology.Sources
GLOSS - Progressive Nervous-System Overload
- Increase the reaction challenge across sessions and weeks, recover the central nervous system, muscles, and joints, then present the problem again seeking a faster response.Sources
GLOSS - Punch Step
- Lead-leg touchdown named for bending and stiffening the lead leg to punch the track hard.Sources
GLOSS - Quick Hands
- Theme of the lane line drill: hands pumping up and down, elbows slightly in front and in; the feet will catch up.Sources
WALK· b6 - Race Truth
- The black tape color: true race spacing. Colors are practice spacings.Sources
TAPE-MAN - Reactive Toe Orientation
- Push the trail heel down at clearance without consciously arranging the toe forward; any forward turn emerges as part of the reaction.Sources
GLOSS - Real versus Feel
- Named Stay Dangerous psychological piece: use a nonliteral felt instruction to organize a desired real action, then distinguish the athlete's reported feel from observed movement.Sources
GLOSS - Return Contrast
- Perceptual and possible physical ease experienced when an athlete returns from normalized harder exposure to familiar race or discounted conditions.Sources
GLOSS - Rhythm
- The organization of required shapes through time and space as a coherent hurdle performance.Sources
GLOSS - Rhythm is King
- The founder's iOS rhythm-training game. Alternating left-right thumb inputs represent alternating left-right foot contacts while the player matches preset hurdle-race rhythms and clears piano-tiles-style hurdles moving down the track.Sources
GLOSS - Rocking Chair
- Backward-and-forward postural rocking during the hurdle race.Sources
GLOSS - Rules of Speed
- The speed relationships a hurdler must preserve while incorporating hurdles into the race.Sources
GLOSS - Seven Paces Is Roughly Eight Feet
- Founder spacing method: measure heel to toe and drop a cone every seven founder paces, producing roughly eight feet between hurdles.Sources
GLOSS - Seven Seasonal Headlines
- Preparation Drills; More Aggressive Drills; Sprinting for Splits; Sprinting for Even Faster Splits; Accurate Hurdling; back to faster splits; back to Accurate Hurdling.Sources
GLOSS - Shapes
- The movement forms an athlete must create before those forms can be organized and repeated through the race.Sources
GLOSS - Shapes, Rhythm, Accuracy
- The provisional central thesis and teaching order: build shapes first, organize rhythm second, then reproduce accurately.Sources
GLOSS - Slinky Diagnostic
- An upright, unbraced torso can rotate, sway laterally, sway forward and backward, or combine those motions like a shaken slinky.Sources
GLOSS - Specific Hurdle Exposure
- An opportunity to practice hurdle-specific movement and rhythm.Sources
GLOSS - Speed Is Primarily Electric
- Founder philosophy that speed is primarily the rapid repetition of required full-range motion, including thigh, arm, and hurdle-contact switching, rather than muscular adaptation alone.Sources
GLOSS - Sprint Step
- The only step between hurdles allowed to open into a full 100-meter sprint cycle; its output creates the next abbreviated Through Step.Sources
GLOSS - Sprinting for Even Faster Splits
- Return to sprinting through hurdles with the objective of improving the established splits further.Sources
GLOSS - Sprinting for Splits
- Sprint through hurdles with split performance as the central output target.Sources
GLOSS - Stair Analogy
- Forward-lean teaching model: the returning foot reaches an elevated stair sooner than a lower floor because it travels less distance. This is a teaching analogy, not standalone biomechanical proof.Sources
GLOSS - Stay Dangerous High Performance Hurdle System
- Integrated philosophy, theory, technique, teaching, drills, programming, recovery, nutrition, competition, evidence, media, and software.Sources
GLOSS - Stretch the Pattern Outward
- Use close and wide exposures in every practice and carry the desired stiff Pop, Bounce, technique, INTENT, rhythm, and smoothness from one condition into the next.Sources
GLOSS - Strong in Our Shapes
- The race-specific ability to create, hold, and rapidly move through the shapes hurdling requires. General strength supports it but does not guarantee it; coordination, flexibility, timing, and positional strength make strength usable through the barriers.Sources
GLOSS - Success Is Trying
- Success is first judged by whether the athlete genuinely attempted the chosen experiment, not only by whether the attempt immediately worked. Founder standing quote: “Success is going from failure to failure with no lack of enthusiasm.”Sources
GLOSS - Tape Zero Point
- Hurdle 1 is always zero; every tape mark is measured from H1.Sources
TAPE-MAN - The Hurdle Belongs in the Dance
- Ballet-derived framing for treating hurdling as rhythmic expression supported by specialized physical preparation.Sources
GLOSS - The Slide
- Progressive reduction in hurdle-interval time from H1 onward until the hurdler reaches max velocity, followed ideally by maintenance of max velocity through H9.Sources
GLOSS - Theme
- The founder's term for the single stated intent of a practice working unit. Each unit carries one theme, a menu of drills beneath it, and a dose on top.
- Thigh to Chest
- Lead-leg cue: thigh to the chest with a bent lead knee and the heel under the hamstring.
- Three Numbers
- The athlete's 1-to-100 ratings for muscular freshness, joint condition, and energy or desire to train at the beginning of practice.Sources
GLOSS - Three Race Structures
- Blocks-to-H1 is one event, H1-to-H2 is a second event, and H2-through-H10 share a third governing philosophy.Sources
GLOSS - Through Step
- Abbreviated cut step named for its intent to send the athlete through the hurdle.Sources
GLOSS - Trail Leg Chicken Paw Slider
- Fence drill: the trail-leg foot slides off a sideways hurdle's crossbar and goes straight down rather than cycling to the front first.Sources
WALK· b5 - Triple Down
- Identify the essential, highest-value elements of each process and concentrate work on them until finite athlete capacity leaves little room for lower-value activity.Sources
GLOSS - Tyson
- Back-to-back uppercut action in which the lead arm punches forward through H1, punches back with a large elbow at lead-leg touchdown, then punches forward again with the next leg contact.Sources
GLOSS - Under-One-Second Hurdle Rhythm
- After H2, find and train a hurdle rhythm that keeps each hurdle interval below one second.Sources
GLOSS - up-DOWN
- Founder-designated capitalized concept: up and then down, with the emphasis on down; wrist in line with elbow, knee in line with ankle, forward lean, straight lines. Theme of the 7s.Sources
WALK· b7 - Upward Jumping
- Anti-pattern of running, planting, launching, and using excessive vertical action to clear hurdles. Jump is a bad word in the founder's hurdle language.Sources
GLOSS - Usain
- Named twice by the founder: skipping into acceleration into max speed and then turning it off; and a bounce run or pretty run for textbook form. The two descriptions are unreconciled.Sources
WALK· b4 - Water Over a Rock
- Mentor-derived hurdle analogy: do not fight the barrier; continue over it through the path of least resistance. Attribution and technical interpretation remain open.Sources
GLOSS - Whack the Track
- Strike the track forcefully back behind the athlete during the Big Four.Sources
GLOSS - Working Sets
- The sets after the warmup drills; home is three sets of seven at a 1-foot discount with the hurdles 3 inches down.Sources
WALK· b13