Exercise 3: Jackknife Sit-Up
Primary Target: Upper and Lower Abs
Lie flat on your back on the floor with your legs straight in front of you.
Place your hands at your sides by the floor for support.
Flexing your lower abdominals, raise your legs until they are perpendicular to the floor.
At this time, raise your shoulders and torso as far as possible from the ground in a curling movement without raising your back from the floor.
Maintaining tension on the abs, lower your legs to the beginning position and then bring your torso to the starting position as well. (Note: Maintain full control throughout the movement. Avoid the temptation to rock back and forth.)