I don't disagree with you, it definitely gets me sweating on the few occasions that I do it, but as you get older it can be a bit more of a chore. We had a local news guy who used to run marathons and stuff like that, he went out shoveled snow, came in and had something happen with his heart and he died. Depending on how heavy and deep it is, it can be very dangerous even when you are in the best of shape.
Yeah I've heard many heart attack stories when it comes to shoveling. I have to look into that as to why that is especially for people who are in decent shape already!