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A study2 has found the two best Swiss ball exercises for working the core. See below:

The roll-out

1. Start on your knees, with forearms resting on the ball. Slowly roll forward, straightening your arms. 2. When you’re as far as you can go without letting your back collapse, use your abs to pull back in.

The pike

1. 2.

Keeping your legs straight, hinge at the hips and roll the ball forward with your feet. Hold for three seconds, then slowly roll back until your belly is parallel with the floor.