Q: how often to exersize

A: It depends on your goals, but for an average person looking to lose some fat and maybe build some muscle... Anywhere between 2 and 5 days a week for weight training, 1 hour or less per session. For cardio my recommendation is only 2-3 times/week, 20-30 minutes at a time -- I like to structure fat-loss around primarily diet and weight training. However if you enjoy cardio, you can certainly do it more often, even every day. If you do a lot of cardio, keep your weight training to fewer sessions and vice versa.