concentric contraction, a common form of muscle contraction that occurs in rhythmic activities when the muscle fibers shorten as tension develops. Compare eccentric contraction. See also isotonic exercise.
1 Multiply by 2/3: Next you want to multiple your weight by 2/3 (or 67%) to determine how much water to drink daily. 2  For example, if you weighed 175 pounds you would multiple that by 2/3 and learn you should be drinking about 117 ounces of water every day.
2. Divide your body weight in half. Divide your weight by half to find out how many ounces of water you should drink each day. For example, if you weigh 150 pounds: 1/2 = 75 ounces. So for someone who weighs 150 pounds, drinking 75 ounces of water per day would be optimal. 3. Activity Levels.