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.
Divide the number of ounces of water you should drink per day by the number of ounces your receptacle holds. For instance, if you weigh 160 lb. and have a water bottle that holds 10 oz. of water, divide 80 by 10 to arrive at 8.