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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.
Exercise Ball Planks. An exercise ball can be used for two tough planks. Kneel with your forearms on the ball, roll the ball forward and straighten your legs to move your body into a plank. Roll the ball in small circles with your arms, keeping your feet on the floor.