No matter which personal trainer you talk to you will hear that drinking enough fluid is very essential to the human body, especially when exercising because water helps the body to remove waste and toxic materials through sweat and urine and bowel movements. When these waste materials are removed from the body, body tissues and cells cannot get poisoned and therefore you remain healthier. Moreover, the body is better able to fight diseases since water is part of lymph fluid which is a part of immune system.