Frog sit-ups

Lie flat on your back with your legs abducted and knees bent, so that your soles are touching (in this position, your legs should resemble a frog’s legs or a diamond). Bring your feet as close to your bum as your flexibility allows.
Bring your arms above your head and cross your hands like shown.

Exhale and squeeze your abs as you raise your upper back off the floor.

Hold the contracted position for a second, then slowly return to the starting position.
Repeat for the recommended number of repetitions.