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EXERCISE Isometric Exercise occurs when your muscles contract but produce no movement. An example of this type of exercise would be pressing against a wall. Isotonic Exercise occurs when your muscles contract to produce movement. An example of this type of exercise would be lifting weights. MUSCLES Muscle Fatigue occurs due to a lack of oxygen in the muscle cells. This causes a build up of lactic acid in the tissue. The resulting oxygen deficiency can lead to cramping and pain which will go away when the exercise slows down. Muscle Growth Muscle Growth occurs due to an increase in the size of the muscle cells, not to an increase in the number of muscle cells. Hypertrophy is the term given to an increase in muscle mass. Atrophy is the term given to a decrease in muscle mass.