Americans should do aerobic exercise for at least 2.5 hours a week. Examples include gardening, quick walking, and dancing; activities that cause only light sweating or a slight to moderate increase in breathing or heart rate. In addition, it is recommended to do muscle strengthening activities twice a week. In a very large study of almost half a million adults, researchers showed that people who were this physically active had a reduced risk of early death from disease such as cardiovascular disease, cancer, and lung disease. A big obstacle to exercise for many people is not having enough time. For people who are unwilling or unable to do both aerobic and muscle strengthening exercises, then aerobic physical activity could be prioritized over muscle strengthening activity.
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