If it's regarding your health, maybe it would be good to get the info from the horses mouth at: http://www.americanheart.org/

Yes Cassie ,this is another classification, where cardiovascular, strength and flexibility exercises are considered. Cardio (aerobic exercise) 2-3 days per week Strength training 3-4 days per week Flexibility 4 -7 days a week. That doesn't require a minimum of 9 days a week ;) ( Yeh there are only 7) ,because as you probably know that flexibility exercises such as stretching and strength (like light weight lifting ) are included many times in cardiovascular exercises.

Good point Cherry! I thought it was three times a week, but I think that's only for cardio.

Hello Richard, Adults should be getting 30 minutes of moderate intensity activity at least 5 times a week. However there are special guidelines for people over the age of 65 or ones with chronic conditions or physical functional limitations (e.g., arthritis) that affect movement ability or physical fitness.