Lying Leg Curl

A complete lying leg curl guide covering pad calibration, knee-flexion technique, diagnostics, regressions, progression logs, and alternatives.

Quick answer: Align the machine pivot with your knee, settle the hips into the pad, curl the roller without lifting the pelvis, and lower it slowly.

Lying leg-curl machine beginner Hamstrings, Calves

How to Do It

  1. Align the knee joint with the machine pivot.
  2. Set the ankle roller above the heels and keep the hips down.
  3. Curl the pad without arching or lifting the pelvis.
  4. Return slowly to a repeatable start position.

Common Mistakes

  • Setting the pivot behind the knee
  • Lifting the hips to start the curl
  • Bouncing at the bottom
  • Comparing unlike machines by pin number

The lying leg curl trains knee flexion with the torso supported on a prone machine. It is different from a seated-vs-lying leg curl comparison: this page owns the lying-machine setup and execution, while the comparison page handles the selection question. A displayed stack number is meaningful only on the same machine, so record the settings as carefully as the load.

Machine calibration

Before loading the stack, identify the pivot, hip pad, chest pad, and ankle roller. Adjust the knee so it sits close to the machine’s axis. The roller should contact the lower leg just above the heels, not the calf’s thickest point if that causes pressure or changes the lever. Set the hip pad so the pelvis can stay down while you breathe. Check that the range limiter, pin, and cable are secure.

Use a light test set. The hips, ribs, and chest should remain in contact with the pads while the knees bend. If the knee is far in front of or behind the pivot, stop and change the setting. If the roller pushes into the Achilles tendon, move it or choose another machine. Individual proportions differ, so “one notch for everyone” is not a useful calibration rule.

Execution and diagnostics

Brace gently and curl the lower legs toward the thighs. Stop at the highest position you can reach without lifting the pelvis or cramping violently. Pause briefly, then lower over two or three seconds until the knees return to the chosen starting angle. Do not bounce off the bottom or let the stack crash. Keep both sides moving together; if one leg reaches the finish first, use a lighter load or a unilateral option if the machine supports it.

Film a side view when learning. A good repetition shows a quiet pelvis, a stable upper body, a consistent roller contact point, and the same start and finish each time. Pelvic lift means the load, range, or pad setting needs attention. A shortened return may indicate fatigue, a machine limit, or an unnecessarily heavy stack. Calf cramping is a reason to check ankle position and reduce the load, not a reason to force the toes into a single direction.

Regressions and progressions

Regress with a lighter stack, a shorter controlled range, or a reduced set. A glute-ham raise or sliding hamstring curl can be useful alternatives, but their resistance and hip demands differ. The Romanian deadlift trains hip extension rather than replacing knee-flexion work exactly.

Progress by keeping the machine settings fixed while adding repetitions within the selected range. When every set reaches the top with the pelvis down and a controlled return, add the smallest available increment. If the next pin causes hip lift, keep the previous load and add a pause or slower eccentric instead. Never compare the stack number with a different brand of machine as if it were the same resistance. General training-volume context comes from the ACSM position stand.

Programming and progression log

Place the curl after a squat, hinge, or warm-up when you want direct hamstring work without making the machine setup rushed. Log the date, machine, knee-pivot setting, pad position, roller position, load, sets × reps, tempo, and first fault. Example: “23 Aug, pivot aligned, pad 4, roller low, 30 kg, 3 × 12, 2-second lower, hips stayed down.” If the log shows cramping, repeated joint pain, numbness, instability, or worsening symptoms, stop and obtain qualified individual advice. For broader hamstring selection, use the hamstring exercises guide.

References

  1. National Strength and Conditioning Association. Anaerobic and Muscle Endurance Development: Lifting Guidelines. National Strength and Conditioning Association (2017)Back to claim
  2. Brad S Currier, Alysha C D'Souza, Maria A Fiatarone Singh, Caroline V Lowisz, Eric S Rawson, Brad J Schoenfeld, Abbie E Smith-Ryan, Jeremy P Steen, Gwendolyn A Thomas, N Travis Triplett, Tyrone A Washington, Timothy J Werner, Stuart M Phillips. American College of Sports Medicine Position Stand. Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults: An Overview of Reviews. Medicine & Science in Sports & Exercise (2026)Back to claim
  3. Deborah Riebe, Barry A Franklin, Paul D Thompson, Carol E Garber, George P Whitfield, Melissa Magal, Linda S Pescatello. Updating ACSM's Recommendations for Exercise Preparticipation Health Screening. Medicine & Science in Sports & Exercise (2015)Back to claim

See our exercise methodology for how this evidence is applied and its limits.

Frequently Asked Questions

Where should the roller sit on a lying leg curl?
Place it just above the heels or lower ankle according to the machine design, without pressing directly into the Achilles tendon or forcing the ankle.
Why do my hips lift during leg curls?
The load may be too heavy, the pad may be poorly set, or the range may exceed your control. Reset the machine and reduce the load before adding repetitions.
Is a lying or seated leg curl better?
Neither is universally better. They use different machine positions and hip angles; choose the option you can calibrate and progress consistently.
Where should my toes point during a lying leg curl?
A neutral foot position, roughly in line with the shin, is a reasonable default. Pointing the toes hard in one direction changes calf involvement slightly but does not change the primary hamstring action; choose the position that lets you keep the ankle relaxed and the roller contact comfortable.
What tempo should I use for a lying leg curl?
A brief pause at the top followed by a two- to three-second lowering phase is a practical default. A slower eccentric can be a useful substitute for adding load when the next available increment causes the hips to lift.