I see too many clients who need a constant reminder to drink water. Never mind that fact that in their work out they have lost any where from a pint to a quart of water from sweat. Not only is hydration important for the muscle tissue, cellular tissue, it is critical for the brain. It is very easy for someone to pass out after heavy excercise and from improper re-hydration. If you live in a dry climate it is even more critical to stay hydrated.