8. V-Sit Crunch
Why it works: This challenges your abs further after the mountain climbers while giving you a minor breather. Even if your abs are buried deep under that belly, this will help build your core strength.
How to do it: Begin on your back with hands extended over your head. Lift your legs and crunch up at the same time, forming your body into the shape of a “V.” Be sure to lift your legs and trunk simultaneously—doing one ahead of the other makes you lose a lot of the effectiveness of the movement. Exhale as you lift your legs and crunch and inhale as you return to the starting position.
Prescription: 15 reps
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