Then increase the setting with each 3-minute set, until you reach a perceived exertion level of 7 or 8. After 2 or 3 weeks, try to begin each set at the second lowest resistance level, assuming it has become comfortable as a base level. If not, keep to the initial setting for a few more weeks. Aerobic dance and calisthenics performed at a fast pace are excellent aerobic activities that give the heart a thorough workout and involve most muscle groups. If you experience pain in a particular part of the body, avoid specific routines that increase the pain until it abates.
Swimming is an excellent alternate exercise.
Both the crawl and the backstroke offer good conditioning. Be sure to alternate with rest periods. As you become stronger, you can add one or two laps. Walking is an excellent aerobic exercise after a heart attack because it is versatile. It offers benefits to people who are very out of shape, but can also be intensified to keep a physically fit person in peak condition.