Oh you poor thing-made me smile tho'
Just breaking my lurking habit to say I couldn't agree more about the fat & fit thing. When I started at the gym I used to be so in awe of the slim ladies in their colour co ordinated thong & bra tops who never broke into a sweat. However, although still far from slim when they started posting the rowing times I was amazed to find I'm faster as well as fatter than them all!
I'm also a demon bike rider and as for the cross trainer....eat my dust skinny!!!
I suppose you don't get fit unless you sweat a bit! I had an ex who was a body builder (yuk, I know but I was just curious...) and gave me such a hard time about my (at that time reasonably slim) figure. I'd never have ventured into a gym with him. You may be in pain, but hey, he never needs to know.