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.
Your weight divided in half. Divide your weight by 1/2 to find out how much water you should drink on a daily basis. For instance, if you weigh 170 pounds: 1/2 = 85 ounces. This means that a person who weighs 170 pounds should drink 85 ounces of water every day. Activity level. Another factor that effects how much water you should drink every day is your level of activity (how much you exercise).