Muscle Building: Isolation Exercise - Situps (Frog style)

Lie on your back on the floor, hands at the sides of your head. Bring your knees up while keeping your feet flat on the floor. Let each knee fall out to the side, down to the floor, or as far as your flexibility allows. Once you have assumed the 'frog' position, lift you shoulders only up off the floor as high as possible while crunching the abdominal muscles. Your legs remain steady and still throughout the exercise. This works the upper abs.