Roger, I really, really do see where you are coming from. You want to be able to do the things that you want to do. I feel the same way.

I am still riding my horse. If I get weak and get killed from it, oh well..... Riding my horse is a major part of defining who I am. I also plan to exert myself singing a concert tomorrow night. If I feel like crap for a week, oh well......... It probably won't kill me.

Keep on keeping on. Just be aware that you may have to modify some things. I make sure to take my mestinon before exerting myself because it is too late afterwards. The drugs do help. If they don't, then they are a waste of time and money.

About riding my horse; I can't really feel confident jumping competitively. I do enjoy trail riding. Maybe if you find that you can't compete well at running, you could enjoy hiking.