What you'll gain

• Trains knee flexion without a leg curl machine, so it works in a home gym.

• Clamping the dumbbell adds an ankle and calf demand that a machine pad removes.

• The setup enforces a slow tempo, which keeps the eccentric under control.

Step-by-Step Instructions

1. 1

   Lie face down on a mat or bench with your legs straight and your hips flat.

2. 2

   Set a light dumbbell upright between your feet, or have a partner place it.

3. 3

   Squeeze the arches of your feet together until the dumbbell is fully secure.

4. 4

   Fold your arms in front of you and brace your abs.

5. 5

   Bend your knees to curl the dumbbell up toward your glutes.

6. 6

   Pause at the top, lower until the legs are almost straight, and repeat.

Common Mistakes

• Starting too heavy, so the dumbbell slips out of the feet part way through the set.

• Lifting the hips to help the curl, which loads the lower back instead of the hamstrings.

• Letting the dumbbell drop at the end of the rep, which skips the eccentric and risks the ankles.

• Rushing the reps, which makes the weight swing rather than the hamstrings pull.

About This Exercise

This is the prone dumbbell version of the leg curl: you lie face down, trap a light dumbbell between the arches of your feet and curl both heels toward your glutes. Only the knees bend, so the hamstrings do the work while the calves help clamp the dumbbell in place and the abs stop the hips lifting. Securing the weight is the difficult part, which is why the dumbbell variation is rated a step above a machine curl even though the joint action is identical. Start light, confirm the dumbbell is stable before the first rep, and keep the tempo slow in both directions. For a library this is the free weight answer to a leg curl machine. It suits home and garage gym program tracks, hamstring accessory blocks where no machine exists, and instructional content on setting the dumbbell up safely.

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