At home Everyone
MediumAbout 4 minOn your own
Lying on your back with the heels on sliders, sliding the legs out and curling them in with the hips up. Strengthens the hamstrings for sprinting.
Video: Muscle & Strength
Also: On a Swiss ball
Lie on your back, knees bent, heels on sliders (or towels on a smooth floor), arms by your sides.
You need: Sliders, or towels on a smooth floor
Slide out only, then lower the hips and reset.
One leg.