A very easy to use counter for the famous Plank exercise. You know what is the next position and when to change it. The Plank uses relative inactivity to challenge the abdominal muscles and strengthen them. In five minutes you get to exercise as many parts as possible of the muscle wall. The result: strong abs, a strong core, more power, better coordination and get to look good on the beach. What it works: Abs, chest, lower back & core Tip: To gain the maximum out of your time in this exercise, tense your abdominal muscle group at each rep. Best full fitness calisthenics exercises and workout! Lose weight, get relief, stay fit! Becoming and staying fit has never been easier with the help of Plank! It takes about 5 minutes in the morning or in the evening at home or at the office to be in a great shape!