I think this is backwards. Not sure what you mean by quickly. Back when I was in racing shape, if I stopped my training plan for as little as two weeks, (prob

I think this is backwards. Not sure what you mean by quickly. Back when I was in racing shape, if I stopped my training plan for as little as two weeks, (probably less actually, but I'm being conservative here) I would have a measurable drop in fitness. Now, as someone who regularly walks the dog and bikes to work, I've got "less to lose" and probably wouldn't deteriorate as much.