Perform all exercises at least three times a week, on alternate days, on a firm (but not too hard) surface, such as an exercise mat. Perform them in the following order. Be sure to breathe normally during all exercises; don't hold your breath. During abdominal exercises, it may be easier to exhale on exertion, that is, inhale when you are down and exhale briskly as you perform the lift. The following exercises work all major muscle groups. Don't skip any!