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  1. Lie on your back with your legs extended and your arms at your sides with your palms facing down. 

2. Flex your abdominal muscles to keep your lower back on the ground. 


3. Raise your legs about 10 Inches (25cm) off the ground. Cross your legs over another and switch them after each repetition. 


4. Continue the exercise until fatique.

Doable at:

Muscle group/groups:

Working muscle/muscles: