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.
The rule of thumb is take your body weight, divide it by 2 (cut it in half), and that's how many ounces of water you should be drinking every day -- if you're active, you need to drink more. In your case, you need to drink about 92 ounces of water every day. That's a little more than 5 16-ounce glasses of water.