Yes. I had to leave my doctoral program because of health issues. Then I had to stop riding and competing horses and sell my lovely stallion since I could no longer breathe well enough to work with him (we did make it to Nationals before I had to quit though). Then I had to stop running (well, OK, jogging) and running around outside with my kids. Now I am just hoping I can play a few games of golf this summer, maybe go on some short flat hikes, do some snorkeling, light gardening. *psi* 3 years ago I was RUNNING up the adirondaks, doing extreme ropes courses, and racing my kids flat out. Just cant do it now, for walks over half a mile I need oxygen or a lot of rest breaks. It can be intensely frustrating and depressing, but I DO have wonderful memories of doing all that stuff and I will turn my energies to different activities and concentrate on what I CAN do. But yes, it changes. And it can change for the worse quickly. So if you have good health, savor it, use it, and for heavens sake, do all you can to protect it.