Muscle Group: Abdominals
Crunches work the entire abdominal area. There are four major abdominal muscles. Your abs support the rest of your torso and lower back. Ab muscles also help us move our legs and shift our hips. When you swing a bat, lift a box, kick a ball or shift your weight for more power, your abs are doing some of the work. The stronger your core is the stronger other parts of your body will be. Having strong abs also reduces your chances of sports injuries.
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.
Curl your shoulders 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. Instead of putting your legs on a bench, try lying on the floor and placing the soles of your feet against a wall at whatever height feels best.