The Science
Speed isn't built
in the gym.
It's built in your chain.
Every elite sprinter is just a kinetic chain — head to toe — passing force into the ground. When one link is off, the rest pay for it. Here's how it actually works, in plain English.
The Kinetic Chain
One weak link.
A whole chain that pays.
Ankle issues climb the chain
A stiff or unstable ankle changes how your foot hits the ground. Your knee compensates. Your hip rotates to protect your knee. Your pelvis tilts to keep balance. By the time the force reaches your hamstring, it's pulling at the wrong angle. That's how an ankle nobody noticed becomes a hamstring tear.
Hips compensate, pelvis tilts
When one hip is tighter than the other, your pelvis tips forward and rotates. Your glutes can't fire properly. Your lower back picks up the slack. You feel it as a tight back or weak finish — the actual problem is upstream, in a hip joint that lost its range.
Forward head kills arm drive
When your head sits in front of your shoulders, your upper back rounds to balance it. Rounded shoulders shorten your arm swing. Short arms mean weak drive phase. You're trying to sprint with the brakes on — and it all started with where your eyes were pointing.
The takeaway: the place that hurts is almost never the place that's broken. Your body is a system. Speed Aligned reads the whole system at once.
The 12 Checkpoints
What we measure.
Why each one matters.
Twelve specific checkpoints. Each one decides how much of your power makes it to the track.
Cervical Stack (Neck)
A stacked neck keeps your center of mass over the track — every degree of forward lean adds braking force and shaves tenths off your 60m.
Shoulder Alignment
Square shoulders unlock full arm swing — and a longer arm swing directly lengthens your stride on the opposite leg.
Thoracic Mobility
A mobile upper back lets your arms drive straight back, channeling force into forward propulsion instead of side-to-side sway.
Arm Drive Symmetry
Symmetrical arms eliminate rotational drag — your legs stop fighting your torso and start adding pure horizontal speed.
Pelvic Tilt
A neutral pelvis fires the glutes correctly, turning every ground contact into forward thrust instead of wasted vertical bounce.
Hip Extension
Full hip extension is what separates 10.5 from 10.0 — it's the final push that adds inches to every stride at top-end speed.
Hip Flexor Length
Loose hip flexors let your knees punch higher and faster — the #1 driver of acceleration out of the blocks.
Knee Drive Height
Higher knee drive recruits more force per stride and adds air time — more air time means longer strides at the same turnover.
Knee Tracking
Knees that track straight return ground force into propulsion — collapse inward and you leak power sideways on every step.
Ankle Stiffness
A stiff ankle acts like a coiled spring, cutting ground contact below 100ms — that's the difference between fast and elite.
Foot Strike Position
Landing under your hips converts impact into instant propulsion — landing out front is a brake pedal you press four times a second.
Stride Symmetry
Even strides keep top-end speed stable through the finish line — asymmetry is why athletes tie up in the last 20m.
Good vs Bad
What good looks like.
What's quietly costing you.
Head & Neck
✕ Bad
Chin drifts forward. Neck muscles work overtime, shoulders round, and your arm swing shrinks. Slower stride frequency past 50m.
✓ Good
Head stacked over shoulders, eyes level. Full arm swing, sharper elbow drive, longer stride — free speed with no extra effort.
Pelvis
✕ Bad
Pelvis tips forward, lower back arches. Glutes shut off, hamstrings overload — the classic hamstring pull setup at top speed.
✓ Good
Pelvis level, ribs stacked. Glutes fire, hips fully extend. More propulsion per stride, faster 60–80m splits.
Ankle
✕ Bad
Ankle collapses on contact. Foot sits on the ground too long. You're muscling each stride instead of bouncing — top speed caps early.
✓ Good
Stiff, springy contact. Ground gives the energy back like a coiled spring. Shorter contact, longer flight — that's elite speed.
Stop guessing.
Start aligning.
One photo. Twelve checkpoints. A complete picture of where your speed is going — and how to get it back.
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