Best Exercise When You're Pooped: Stretching

If you're going to plop down in front of the TV instead of exercising, at least do some stretches. "Stretching increases bloodflow without being too taxing, giving you that little boost you may need to get going." Even if you only stretch, it will help you rest better, so your body will be ready to go for your next workout. Also, if you had an extremely taxing workout the day before, you might just want to do a light work out and stretching to avoid any kind of injury!  And most trainers believe that we all need to stretch more anyway.