Leg raises are a common abdominal exercise nearly as old as the sit-up. Leg raises place primary stress on the lower half of the rectus abdominis although the muscle fibers of the upper rectus abdominia are recruited as well. Secondary stress is also placed on the intercostal muscles.
How to do:
1. Lie on your back on an inclined ab board with your head toward the raised end.
2. Grasp the end of upper bench with your hands to stabilize
your body.
3. Bend your leg 15-20 degrees or until you feel your back
relax.
4. Use your abdominal muscles to raise your feet in an arc to
a position directly above your head.
5. Drop your feet in a return arc until they clear the bench.
6. Repeat until the desired number of repetitions are
complete.
7. Add resistance by raising the incline angle of the bench or
by holding a light plate or dumbbell between your feet.