Standing Leg Curl
The standing leg curl isolates one hamstring at a time on a machine that pads your leg just above the ankle, curling your heel up toward your glutes against resistance. Training one leg at a time means each side has to work without help from the other, which makes it a useful way to catch and fix a strength imbalance that a two-legged lying or seated curl can hide.
Why it works
The hamstrings cross the back of the knee, and curling your heel toward your glutes is their main job in almost every leg day. Standing on one leg while the machine pad curls the other removes the bigger muscles of your hips and lower back from helping, so the hamstring on the working leg has to produce nearly all the force itself. Because each leg works alone, the exercise exposes a side that's weaker or more fatigued than the other, something a bilateral curl machine often lets the stronger leg compensate for without you noticing.
Set up
- Stand facing the machine and position the back of your working ankle against the lower pad.
- Hold the support handles and stand tall on your free leg, with a slight bend in your working knee to start.
- Set the resistance light enough to complete the full set with good control.
How to do it
- Curl your heel up toward your glutes, keeping your hips still and facing forward.
- Pause briefly once your knee is fully bent.
- Lower the weight back down slowly, resisting it rather than letting it drop.
- Keep your standing leg steady throughout instead of letting your hips sway.
- Repeat for the set, then switch legs.
Form cues
- Curl your heel toward your glutes, not your hips toward the pad.
- Keep your standing leg still, no swaying.
- Control the weight down, don't let it drop.
- Hips face forward the whole set.
Breathing: Exhale as you curl your heel up, inhale as you lower the weight back down.
Common mistakes
Swinging the hips to help start the curl.
Fix: Keep your standing leg planted and your hips still; let the hamstring alone drive the movement.
Letting the weight drop back down between reps.
Fix: Lower the pad with the same control you used to curl it up; the lowering phase builds strength too.
Picking a weight so heavy that your hips rock to finish the rep.
Fix: Drop the weight until you can complete every rep without your standing leg or hips moving to assist.
How to program it
- Two or three sets of 10 to 15 reps per leg is a solid range for this single-joint hamstring exercise.
- Twice a week is plenty, especially if you're also doing deadlifts, hip hinges, or lunges that already load the hamstrings.
- Do the weaker leg first if one side is noticeably behind, so it gets your freshest effort rather than whatever's left after the stronger side.
Safety notes
- Keep the movement controlled rather than curling explosively; a fast kick-up can strain the knee or hamstring at the top.
- Hold onto the support handles throughout so your standing leg doesn't also have to manage your balance under load.
Exercise profile
- Force
- Pull
- Mechanics
- Isolation
- Category
- Strength
Frequently asked questions
How many reps of standing leg curl should I do per leg?
Two or three sets of 10 to 15 reps per leg works well, done twice a week alongside your other lower-body training.
Why does one leg feel weaker than the other?
That's common and part of the point of training one leg at a time; keep the weight the same on both sides and let the weaker leg catch up over a few weeks rather than reducing the stronger side's work.
What can I do without access to a standing leg curl machine?
A seated or lying leg curl machine trains the same muscle with both legs supported, or a resistance band hamstring curl works with no machine at all.
Why do I feel this in my calf as much as my hamstring?
Keep your ankle relaxed rather than pointing your toes hard as you curl; flexing the foot shifts some of the work to the calf instead of the hamstring.