Hydration Refers to the amount of fluid in your body. It is important to replace any fluid your body loses during physical activity. Body Composition is the makeup of your body in terms of lean mass muscle bone vital tissue and organs and fat mass. Endurance activities can help you decrease your fat mass by burning calories and strength-building activities can help you build your muscle mass. Dehydration Is the condition resulting from the excessive loss of body water. Body Mass Index BMI Measures weight in relation to height. BMI is determined by a mathematical formula that helps to ""estimate"" body fat. BMI is a better predictor of disease risk than body weight alone. Fitness trainer/instructor Is a person with credentials and experience in health and exercise who conducts fitness testing and designs and implements exercise programs for individuals. Cardiorespiratory Endurance Is the ability of the circulatory and respiratory systems to adjust to and recover from the effects of whole body exercise or work.The circulatory and respiratory systems deliver oxygen and nutrients to tissues and remove waste products. Long runs and swims are example of endurance activities. Maximal Aerobic Power or Maximal Oxygen Uptake VO2 max Indicates aerobic fitness - the ability to sustain work for prolonged periods. This is usually experienced in the abilities to walk run and climb uphill swim and other activities performed continuously for more than 15 minutes. Very Active Physical Activity Level The energy that is required for activities equivalent to walking 17 miles/day. Exercise Is a type of physical activity that is planned structured and consists of repetitive body movement done to improve or maintain one or more components of physical fitness. It is usually done for the purpose of enhancing health or physical fitness or just to have fun. Physical Activity Is bodily movement produced by skeletal muscle contraction that results in energy expenditure. basketball.