The title of this post is one of those sayings I accepted as a normal part of life. I'm convinced now that most people do not get raised with quite such enthusiasm.
I'm not going to lie, I'm rounder than I'd like in places and I'm trying to do weights without incurring too much punishment from the Chronic Fatigue monster. You may find this article on using exercise to tone your body helpful:
The usual disclaimers apply, talk to your doctor before changing your approach to your health and well being.