A upper legs exercise targeting the hamstrings, performed with body weight.

Lie face down on a bench with your hips at the edge and your legs extended straight behind you.
Hold onto the bench for support.
Keeping your upper body still, bend your knees and curl your legs towards your glutes.
Pause for a moment at the top, then slowly extend your legs back to the starting position.
Repeat for the desired number of repetitions.
Primary (target)
Secondary
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