Bodyweight Exercise: Ball Jack Knife

The Ball Jackknife is a fun exercise that really works your core, since you need to constantly stabilize yourself during the movement.

Step 1: Start by getting into a push up position, but with the tops of your feet resting on a stability ball. Arms should be straight (and will remain like that through the whole movement.)

Step 2: Curl your knees in to your chest, rolling the ball in with you. You will control the ball’s movement with your toes.

Return to the starting position by pushing your feet back. Repeat.

Ball Jack Knife video:

[video coming soon]

See more exercise guides in The Bodyweight Exercise Collection.