Go for moderate activity, like brisk walking, at least 30 minutes a day, at least 5 days a week. If you are short on time, vigorous activity, like jogging, gives you the same benefit.
Related FAQs:
http://healthtopquestions.com/?p=486
http://healthtopquestions.com/?p=490
http://healthtopquestions.com/?p=1333
