Lying Leg Curl Isometric Hold
Pausing the leg curl at roughly ninety degrees of knee flexion keeps continuous tension on the hamstrings where they contract hardest. It is a low-skill way to accumulate hamstring work, and the isometric hold is gentle on the joint while still driving fatigue. Great as an accessory for sprinters and as prehab for hamstring strains.
- Equipment
- Machine
- Body part
- Hamstring
- Type
- Strength
- Browse by muscle
- Biceps Femoris, Semitendinosus
- Browse by movement
- Knee Flexion
- Target
- Biceps Femoris, Semitendinosus
- Secondary
- Gastrocnemius Medial Head, Gastrocnemius Lateral Head
How to do it
- 1
Lie face down on the leg curl machine and set the pad just above your heels.
- 2
Curl your heels up until your knees are bent to about ninety degrees.
- 3
Stop and hold, squeezing the hamstrings without letting the pad drift down.
- 4
Keep your hips pressed into the pad so the movement stays at the knee.
- 5
Hold for the target time, then lower under control.
Tips
- Keep your hips down; letting them rise shifts the load off the hamstrings.
- Point the toes toward your shins to bring the calves in as helpers, or point them away to isolate the hamstrings more.
- Choose a load you can hold cleanly rather than one that makes the pad creep.
Variations
Common mistakes
- Your knees sit on the pad instead of a little off the end of it, so the machine's hinge no longer lines up with your knee and the pad digs into the kneecaps.
- One heel presses harder than the other and the pad tilts, which is easy to miss lying face down; glance at the pad, or do the hold one leg at a time.
- Hands pull hard on the handles and the chest lifts off the bench, which brings the low back into a hold meant for the hamstrings.
- A sixty-second hold at a light setting has turned this into an endurance drill; twenty or thirty hard seconds at a load that actually challenges the curl does more.
- At the end of the hold the heels drop and the plates crash down, throwing fatigued hamstrings into a fast stretch; lower the pad under control instead.
Frequently asked
- How many sets of the lying leg curl isometric hold should a beginner do?
- Three holds of 20 to 30 seconds at a setting you can keep at ninety degrees without the pad creeping, with a minute of rest. A second option that sits well at the end of a leg day: eight curls with a five-second hold at the top of each. Add weight rather than seconds once 30 seconds is easy, since longer and lighter turns this into a different exercise.
- What can I do instead of a lying leg curl isometric hold with no machine?
- A stability ball curl held with the heels dug in and the hips up trains the same knee flexion and is harder than it looks. Sliders or a towel on a smooth floor give you the same hold from a bridge. A band looped around one ankle and anchored behind you lets you hold ninety degrees one leg at a time. With a partner, have them resist your heel at ninety degrees for 10 seconds per effort.
- What is the lying leg curl isometric hold for, and when is it not the right pick?
- It piles tension onto the hamstrings at the knee with almost no skill required and very little joint stress, which makes it a useful accessory for sprinters and a gentle way to load the muscle when something else is sore. It is not enough alone: the hamstrings also extend the hip and work at long lengths, which this never touches, so keep Romanian deadlifts or Nordic work in the plan. End the set if the muscle starts to cramp rather than fighting it.
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