Aerobic exercise is a type of exercise that involves rhythmic movement and increases the heart rate, such as running, swimming, or cycling. Isometric exercise is a type of exercise that involves static contraction of the muscles without any visible movement, such as holding a plank position. Isotonic exercise is a type of exercise that involves dynamic contraction of the muscles with visible movement, such as lifting weights or doing push-ups. All three types of exercise are important for overall health and fitness.