4. JackKnifes

Laying on your back with legs flat and arms straight up above your head, fold your body up to perform a jackknife. Jackknifes are a super effective exercise to tone and strengthen your abdominal muscles. Since this exercise is so intense you may find it difficult to perform one so feel free to start out easy and modify this with a one leg jackknife. Alternate raising arms and legs for 10 on each side.

Dancing Plank
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