Body part worked: Abs, core
When to do it: First in your workout if your core is weak; last in your workout if your goal is maximum strength
How to do it: Get into a plank position with your forearms on the floor and your feet on Valslides (valslide.com), furniture sliders, or even a towel (if you’re on a waxed, wooden floor). Brace your abs and push your arms into the floor so that you slide backward a few inches—until you feel your body is about to lose tension. Then pull yourself forward again. Each rep looks like a sawing motion.
Benefits: The bodysaw works the entire core and is safer for your lower back than any situp or crunch variation
Prescription: Three sets of as many reps as possible
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