Muscles worked: Abdominals
1) lie down on the ground with your chest facing up
2) bend your knees to a 45 degree angle
3) place your hands on the side of your head and your head looking forward and slightly up torwards the ceiling
4) inhale, brace your core and sit up till your chest touches your knees, exhale at the top.
5) lower your body down back to its starting position and repeat.