Strength training builds muscle strength, endurance, cardiovascular function, joint function, and reduces injury risk by using weights to create resistance against muscular contraction. It increases muscle size and contributes to weight loss. Bodyweight training is another effective form that uses one's own body weight instead of equipment. When starting strength training, begin with bodyweight exercises before using weights, focus on proper form, and allow muscles to recover between workout sessions in order to see results in increased strength and muscle size over time.