Knee drive is the forward swing of your thigh during a sprint: the leg that just pushed off folds up under your hip, the thigh swings forward ahead of your body, then it comes back down to strike the ground under you. Research links faster top speed to a faster thigh swing and to the swing knee being further in front when the other foot lands, while the peak height of the knee is only weakly tied to speed. So the goal is a fast, early knee in front of you, not the highest knee you can make.
Recover the heel
As your foot leaves the ground, let the heel fold up toward your glute and bring it forward under your hip. Don't let it kick up and hang out behind you.
a short, folded leg swinging through under you.
Pull your toes up as the foot comes through, so the foot is ready to land under you.
knee up, toes up.
Drive the knee forward
Swing the thigh forward fast, from the hip. Speed of the thigh matters more than how high it ends up.
a quick scissor between your thighs.
Get the swing knee in front of your hips by the time your other foot lands. In studies of trained sprinters the swing thigh was a few degrees to about 15° in front of vertical at that moment, and faster sprinters were further forward.
your knees passing each other early, in front of you.
Stay tall and let the knee rise as high as the speed carries it. Don't lean back or slow your rhythm to force extra height.
hips high, chest tall, knee out in front.
Strike down and back
From the top of the swing, drive the thigh straight back down so the foot lands close under your hips, already moving backward as it touches.
punching the ground down and back.
Keep the landing leg firm and get off the ground quickly, then let that leg fold and swing through again.
a stiff, springy contact, not a soft sink.
Feel it
A fast scissor of the thighs, the cue some coaches call "whip from the hip": as one thigh swings forward the other is driving back down. Australian Athletics uses "knee up, toes up, punch down." If your feet feel like they trail behind you and the knee arrives late and low, shorten the fold of the heel and swing the thigh through sooner. If you feel yourself leaning back to get the knee higher, you're chasing height instead of speed.
Fix-its
- Your swing knee is still behind your hips when the other foot lands (late knee) Fold the heel up under the hip right after push-off and swing the thigh through sooner. Groove it with A-marches, then A-skips.
- Your heel kicks up and hangs out behind you Bring the heel forward under your hip as it folds, not up behind you. Ankling drills help you feel the foot cycle under the body.
- You lean back or slow down to lift the knee higher Stay tall and keep your rhythm. Peak knee height is only weakly linked to speed; a fast thigh swing is what matters.
- You reach the foot out in front to land Drive the thigh back down early so the foot lands close under your hips, already moving backward.
- The landing feels soft and long Keep the landing leg firm and aim for a quick contact. Ankling helps you rehearse quick contacts under your hips.
Drill
- Warm up fully first. Stop the session if you feel a sharp pull or pain in the back of the thigh.
- A-march, then A-skip: knee up, toes up, punch down, staying tall. Treat these as warm-up and rhythm drills; the thigh swings much slower than in a real sprint.
- Ankling: quick, small contacts under your hips with the heel folding and cycling forward.
- Build-up sprints: accelerate gradually and hold top speed for a short stretch, thinking about the knees passing early in front of you. This is where real knee drive happens.
- Film from the side at 240 fps if your phone has it (120 fps at least) and check where the swing knee is when the other foot lands.
Sources
- Miyashiro, Nagahara, Yamamoto & Nishijima — Kinematics of Maximal Speed Sprinting With Different Running Speed, Leg Length, and Step Characteristics, Frontiers in Sports and Active Living (2019)
- Clark, Meng & Stearne — 'Whip from the hip': thigh angular motion, ground contact mechanics, and running speed, Biology Open (2020)
- Clark, Meng, Walts, Ryan & Stearne — Angular kinematics during top speed sprinting in male intercollegiate track and field and team sport athletes, Frontiers in Sports and Active Living (2025)
- Haugen et al. — On the importance of 'front-side mechanics' in athletics sprinting, IJSPP (2018)
- Australian Athletics — Rethinking the Role of A- and B-Skips in Improving Sprinting Performance
Last checked 2026-10-25.