Jackknife Sit-up

Main Muscle Worked: Abs

Equipment: Body only

Mechanics Type: Compound

Exercise Instructions: Jackknife Sit-up

1. Lie flat on the floor with your arms fully extended back behind your head and you legs straight.
2. Bend at the waist and contract your abs whilst simultaneously raising your legs and arms to meet in a jackknife position above your stomach. 
3. Lower your arms and legs back to the starting position and repeat.

Beginners

If you can't yet perform the Jackknife Sit-up try starting with the standard sit-up first and build up abdominal strength before progressing.

Experts

If you are starting to find the jackknife exercise particularly easy try placing a weight or medicine ball between your feet for a seriously intense ab workout.