Exercise!!!

From My InBox:

I was bound and determined to get back in shape,
So I thought I'd begin with an exercise tape.

I couldn't quite manage to do what they said,
As I huffed and I puffed till I thought I was dead!

They said I'd get used to the routine in time,
But I have to admit that I'm well past my prime.

The smiles on those models could not have been real,
For it took me three weeks for my body to heal.

Besides, they all needed some meat on their bones,
And I don't want to look like one of their clones.

So I've thrown in the trash that old exercise tape!
I'm already in shape – for round is a shape!