This is how you do it
Begin on the floor lying face up (Supine) with your arms by your side for support.
Brace and flex your legs to bring your knees to your chest.
Extend your legs straight just above the floor.
Repeat and flex your legs to bring your knees to your chest.
1. Remember to maintain the brace throughout the exercise and don’t allow the legs or feet to touch the floor.
Crab Toe Taps