Crunch kicks

Muscles worked

You need

How to do it

1. Lie back with your head and shoulders lifted off the floor and your arms extended along your sides, palms hovering or lightly touching the floor.
2. Tuck your knees in toward your chest, then kick both legs out straight so they hover above the floor - and pull them right back in.
3. Your upper body holds its lifted crunch position the whole time while your legs fold and extend, and your lower back stays pressed into the floor.