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To test and strengthen your balance, try a side plank with a leg raise â get into side plank position, then lift your top leg and hold for one count. Lower it and repeat, then switch sides. In addition, planks work all the muscles you need to maintain proper posture, like your back, chest, shoulders, abs, and neck.
Each variation targets and challenges different muscles, but when done correctly planks can build strength in your abdominal muscles, upper and lower back, shoulders, chest, quads and glutes. See Also: How to Do a PlankPhoto Credit: ShutterstockClick Here to See More Ways to Get Strong Without Lifting Weights.