Quadruped Leg Curl

Body Part: Thighs

Muscle: Other

Equipment: Other

Quadruped Leg Curl is a floor-based hamstring drill performed from a hands-and-knees position. One leg stays lifted behind the body while the knee bends and straightens under control, so the back of the thigh has to do the work without help from swinging or spinal extension. In the image, the working leg begins long and then curls toward the glute, which makes the exercise feel more like a controlled knee-flexion pattern than a big hip drive.

That setup matters because the torso, pelvis, and supporting knee all have to stay organized while the lower leg moves. Hands go under the shoulders, the non-working knee stays under the hip, and the lifted thigh should remain roughly in line with the trunk. If the ribs flare or the low back arches, the movement turns into a back-extension drill and the hamstrings lose tension.

The goal is a small, precise rep: extend the working leg back, brace, curl the heel upward toward the ceiling and then toward the glute, and keep the pelvis square to the floor. The upper leg should stay steady while the knee closes and opens. That makes the exercise useful for hamstring control, posterior-chain activation, and cleaning up side-to-side differences without needing heavy load.

Use Quadruped Leg Curl as accessory work, warm-up activation, or a light finisher after bigger lower-body lifts. It pairs well with bridges, Romanian deadlifts, and other hamstring-focused exercises because it biases control and end-range tension instead of brute force. Beginners can learn it easily if they keep the motion slow, the range honest, and the trunk quiet.

Stay strict: move the lower leg, not the pelvis; keep the neck long; and stop the set if the low back starts taking over or the supporting shoulder collapses. A clean rep should leave the back of the thigh working hard while the body stays stacked and stable.

Instructions

• Start on your hands and knees with your wrists under your shoulders and your support knee under your hip.
• Extend one leg straight behind you so the thigh stays in line with your torso and the pelvis stays square to the floor.
• Keep your abs braced and your low back neutral before you begin the curl.
• From the long-leg position, bend the working knee and curl the heel upward toward your glute.
• Keep the upper leg lifted and as still as possible while the lower leg moves.
• Pause briefly at the top when the hamstrings are fully shortened.
• Lower the foot back out with control until the leg is long again behind you.
• Keep breathing steady, then complete all reps on one side before switching legs.

Tips & Tricks

• Think about curling the heel toward your hamstring, not kicking the foot upward with momentum.
• Keep both hip bones facing the floor; twisting the pelvis reduces hamstring tension.
• If your low back arches, shorten the range and re-brace before the next rep.
• Press evenly through both hands so the shoulders stay stacked instead of rocking side to side.
• Use a slower lowering phase to keep tension on the back of the thigh longer.
• A slight pause at the top makes the shortened hamstring position much more effective.
• Keep the working knee from flaring out; let the knee flex and extend in a clean line.
• Stop the set if you feel the movement mostly in your lower back, hips, or supporting shoulder.

Frequently Asked Questions

What does Quadruped Leg Curl train most?

It mainly trains the hamstrings through knee flexion, with the glutes, core, and shoulders helping you stay stable.

Can beginners perform this exercise?

Yes. It is beginner-friendly if you keep the range small, the pelvis square, and the tempo slow.

Where should I feel the movement?

You should feel the back of the working thigh doing most of the work, with the core and shoulders only supporting the position.

Why should the thigh stay lifted while the knee bends?

Keeping the thigh steady isolates the knee-flexion part of the movement and prevents it from turning into a hip swing.

What is the biggest form mistake?

The most common mistake is arching the low back or rotating the hips to cheat the curl.

Can I add load to Quadruped Leg Curl?

Yes, but only after you can keep the trunk quiet. A light ankle weight or cable can work if it does not change your torso position.

How many reps should I use?

Higher-quality sets of 8 to 15 controlled reps per side usually work well because the exercise is about precision, not max load.

What should I do if I feel cramping in the hamstring?

Reduce the range, slow the lowering phase, and keep the pelvis still so the muscle is not forced to work through a sloppy position.