Crunch (on bosu ball)

How to do it

Press your feet firmly into the floor to anchor your lower body throughout each rep.

1. 1

   Sit on the bosu ball with your feet flat on the ground.

2. 2

   Lie back so that the lower part of your back is centered on the top of the bosu ball.

3. 3

   Place your hands lightly behind your head or across your chest.

4. 4

   Contract your abs to lift your upper body towards your knees, keeping your lower back pressed against the bosu ball.

5. 5

   Slowly lower back down to the starting position.

6. 6

   Repeat for the desired number of repetitions.

Common mistakes

• ✕Yanking the neck forward with the hands
• ✕Arching the lower back off the bosu
• ✕Bridging the hips up off the bosu ball