Sit-ups are great exercises you can do to build your abdominal muscles and your hip flexors, muscles you use in practically every activity. Building strength in these areas will help prevent injury and help you move more easily.
Lie on your back with your knees bent at a 90-degree angle. Your feet may be either together or up to 12 inches apart. Interlock your hands behind your head. Raise your upper body forward until you are sitting up. Lower your body until the bottom of your shoulder blades touch the ground. Repeat as many sit-ups as you can do correctly.
Sit-Up Tips
• Keep your feet firmly on the ground.
• When sitting up, raise your upper body far enough so that the base of your neck is above the base of your spine.
• When lowering down, keep head, hands, arms and elbows from touching the ground to maintain tension in the abs and hip flexors.