Like some exercise is a term that can refer to two types of exercise: AEROBIC and isotonic. AEROBIC exercise is any physical activity that uses large muscle groups and increases the heart rate for an extended period of time. Examples of AEROBIC exercise include running, swimming, and cycling. Isotonic exercise is any type of exercise that involves contracting and relaxing muscles against resistance. Examples of isotonic exercise include weight lifting, push-ups, and sit-ups. Both AEROBIC and isotonic exercises are important for overall health and fitness.