Recently the Office of Disease Prevention and Health Promotionand the U.S. Department of Health and Human Services put out recommendations on physical activity guidelines. A link to the guidelines can be found here.
Here is a link to the summary if you don’t have time to read 76 pages.
Some physical activity is better than none.
Aerobic (endurance), muscle-strengthening (resistance), and bone-strengtheningphysical activity are all beneficial.
Children and adolescents should do 60 minutes (1 hour) or more of physical activity daily.
For substantial health benefits, adults should do at least 150 minutes (2 hours and 30 minutes) a week of moderate-intensity, or 75 minutes (1 hour and 15 minutes) a week of vigorous-intensity aerobic physical activity, or an equivalent combination of moderate- and vigorous intensity aerobic activity. Aerobic activity should be performed in episodes of at least 10 minutes, and preferably, it should be spread throughout the week.
Another way to look at this is that the government recommends 30 minutes of moderate activity 5 times a week and 15 minutes of intense activity 5 times a week, whether aerobic ormuscle strengtheningin nature.