What exercise does:
Crunches work the entire abdominal area.
Implementation: (A)
Lie back on the floor, your legs
across a bench in front of you. Place your hands behind your neck or keep them
in front of you, whatever is most comfortable for you. (B) Curl your shoulders
and trunk upward toward your knees, rounding your back. Don't lift your whole
back off the floor, just roll forward and crunch your rib cage toward your
pelvis. At the top of the movement, deliberately give an extra
"crunch" of the abdominal to achieve total contraction, then release
and lower your shoulders back to the starting position. You have to do
each rep methodically and under control. You can change the angle of stress on
your abdominal by raising your foot position. In stead of putting your legs
across a bench, try lying on the floor and placing the soles of your feet
against a wall at whatever height feels best.