Jacknife Sit-Ups

SETS : 1
REPS : 15

1. Lie on your back, with your arms straight behind your head on the floor.

2. Using your buttocks as a pivot point, bend at the waist and raise your arms and your legs until your feet and hands meet in a jacknife motion.

3. Keep your legs and arms straight in this motion.

4. Lower your arms and legs and repeat.