However, excessive amounts of activity should be avoided, because risk of injury increases with greater amounts of activity, as does the risk of menstrual abnormalities and bone weakening. Women with chronic health problems, such as heart disease, diabetes, or obesity, or who are at high risk for these conditions should first consult a physician before beginning a new program of physical activity. Women over age 50 who plan to begin a new program of vigorous physical activity should first consult a physician to be sure they do not have heart disease or other health problems. The emphasis on moderate amounts of physical activity makes it possible to vary activities to meet individual needs, preferences, and life circumstances. More than 25 percent of U.S. women are not active at all.
Physical inactivity is more common among women than men.
Social support from family and friends has been consistently and positively related to regular physical activity. Helps maintain healthy bones, muscles, and joints. Helps control weight, build lean muscle, and reduce body fat. Helps control joint swelling and pain associated with arthritis. May enhance the effect of estrogen replacement therapy in decreasing bone loss after menopause.