Exercise is a planned, structured and repetitive physical activity. In theory, exercise not only conditions the body, but it also improves health, maintains fitness and helps rehabilitate injured parts of the body. Exercise includes activities like running or walking as well as muscle or weight training.
There are three main techniques used for muscle training: isokinetic, isometric, and isotonic. Isometric muscle training is the contraction of a muscle against an immovable force. Isotonic muscle training involves contractions where tension is equal throughout the range of motion. Isokinetic muscle training is a type of contraction where the speed of movement is fixed and resistance varies with the force exerted.
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Natural Medicines rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.
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In theory, muscle training results in benefits such as increased muscle strength, improved joint mobility and endurance, and improved emotional health. Proponents of weight training believe that it may prevent osteoporosis, coronary heart disease and diabetes, as well as reduce risk of fatigue, aging, and depressive symptoms.