Muscles trained: Abdominals.

1. Begin lying on your back with hands straight up and legs together in the air. Your knees are bent at 90 degrees and shins are parallel to the floor. This is your starting position.
2. Raise your head, shoulders, and chest up as high as possible, keep your hands straight up all the time during the exercise and look straight up as well. Tense your abdominal muscles when in the highest point, pause and slowly come back to the starting position.
See also:

Stability Ball Abdominal Crunch

Abdominal Crunch |