Oh yes I forgot, its important when exercising to keep the body guessing. Meaning that if you do the same exercise week in week out your body gets used to it and you sort of plateu out. So try to mix it up a little. Go for a brisk walk one day, then rest, then go for a swim, rest then a bike ride. Then the next week change to order. The same is said for aerobic exercises. I train 3 times a week using 3 different programs. No weights involved only my own body weight and its high intensity stuff, resulting in 500 - 900 reps in 45 minutes depending on which particular program i'm following.