How to Do the Body Saw Exercise and Build Abs, Back and Calves Believe it or not, the body saw isn’t a woodshop class—it’s actually a clever variation on the plank exercise. This simple exercise is designed to work your abdominals, calves, and back muscles. Best of all, it doesn’t require any special equipment![1] If you’re getting tired of traditional planks, crunches, and sit-ups, then this ab exercise might be a good way to spice up your workout. Lower yourself into a low plank position. Bend your elbows 90 degrees and place your forearms on the ground. Line up your forearms beneath your shoulders, with your head facing forward. Then, lift yourself onto your toes, keeping your back as straight as possible.[2] Tighten your abs, shoulders, quads, glutes, and arms, so you’re completely firm and stable as you start the exercise.[3] While you’re in this starting position, keep your head lined up with your hands.[4] Essentially, you’ll be staying in the plank position for the entire body saw exercise. This exercise can be pretty tough, especially if you don’t have a lot of experience with core exercises. Don’t be discouraged if you have a little trouble at first! Shift your entire body forward with your elbows and toes. Bring the center of your body forward, shifting your weight from the balls of your feet to your tiptoes. Pull your nose past your hands to complete the first half of the rep. Tighten your abs as you shift yourself forward, and keep your back straight.[5]