Moving Claw Series
Also works: Calves · Quadriceps
A running drill done over 20-30 metres in which you exaggerate the recovery of the leg — heel snapping towards the glute, knee driving through, foot clawing back into the ground under your hip. It rehearses upright sprint mechanics at a speed where you can still feel what your legs are doing.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Warm up thoroughly first — this drill puts the hamstrings through a long, fast range and cold ones do not enjoy it.
- Mark out 20-30 metres of flat, even ground with a clear walk-back lane.
- Stand tall with your ribs stacked over your hips, not leaning back from the lower spine.
- Set your arms at roughly 90 degrees at the elbow and keep them there for the whole run.
Every rep
Breathing & tempo — Breathe freely and rhythmically with the stride — nothing here is braced. Rhythm matters more than pace: aim for a quick, even cadence rather than long, floaty steps.
Before you load it
- The hamstrings are working near end range at speed here. Do not run this cold, and stop for the day at the first hint of a grab or twinge behind the thigh.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Bodyweight only; a weighted vest or sled ruins the mechanics you are trying to rehearse. Progress by raising the speed at which you can still hold the pattern, not by adding distance. When the claw stays clean at three-quarter pace, move on to actual sprints.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Shorten the stride and think of the foot arriving beneath your belt buckle. Increase the cadence and let the ground come to you rather than reaching for it.
Brace your abs and stack your ribcage over your pelvis. Tall means a long spine, not an arched one — the lean should come from the ankles if it comes at all.
Drive the elbows straight back along your sides, hands from hip to cheek. Keep the thumbs pointing forward to stop the arms crossing the midline.
Cap it at 20-30 metres, walk all the way back, and stop the session when the mechanics deteriorate — usually after four or five runs.
Why bother
At full speed a foot is on the ground for about a tenth of a second, which is far too quick to correct anything consciously. The claw series slows the same cycle down enough that you can feel the heel recover close to the glute, the knee come through in front, and the foot sweep backwards to meet the ground rather than land ahead of you.
The clawing action is the point. A foot that lands in front of your hips brakes you on every step. A foot already moving backwards at touchdown does not. That backward sweep, plus the tight arm punch that keeps your trunk from twisting against it, is the whole content of the drill.
Where it fits
In the warm-up, after you are properly hot and before any sprinting or jumping. Three to five runs of 20-30 metres with a walk back is a full dose. It is a rehearsal, not a workout — if you are gasping at the end of it, you have run it too fast and taught yourself nothing.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
When this gets easy
Asked and answered
How fast should I be running during the drill?
Around half to three-quarters of your top speed. Slower than that and it stops looking like running; faster and you cannot feel the corrections you are supposed to be making. If you cannot describe what your heel did on the last step, you were going too fast.
Is this a hamstring exercise?
It loads the hamstrings hard in a lengthened, fast position, but it does not build them. Use Romanian deadlifts, glute-ham raises or leg curls for strength, and use this drill for the mechanics. Doing the drill on hamstrings that have never been trained heavy is how people pull them.
Do I need spikes or a track?
No. Any flat, even surface with reliable grip works, and grass is kinder on the joints than tarmac. What matters is that the ground is predictable — a rut or a slick patch during a fast foot strike is a real injury risk.
Can I use this as a warm-up before leg day?
Yes, and it is a good one — it raises temperature and rehearses hip extension without fatiguing you. Keep it to two or three easy runs in that context and save the sharper versions for days when sprinting is the actual session.