I hate: "I can't"

I've noticed that nothing quite makes me seeth nearly as much as "I can't" - especially when we're talking about physical limitations.  Having trouble with what I thought was elevation just made me nuts.  I kept thinking that I should give up and do something more productive rather than going up to elevations that make me miserable on a regular basis.  But I never could just drop it and now that I've figured out that the issue is over-exertion and not necessarily elevation, I'm really glad I did.