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Plank

Plank
Balancing on your forearms, stretch your body out to a push up position. Keep your back as straight as possible and draw your belly button into your spine. For more oblique work, tap your right hip bone to the ground, return to center, tap your left hip bone to the ground. For more arm work, alternate between lying on your forearms and pushing yourself up to a full push-up position. (If you can, sneak in one pushup per rep.) To tone up your butt, alternate lifting legs as you hold your plank position. (3 reps. hold each plank for 30 seconds, or challenge yourself to a full minute.) [Photo via]
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