I think all of us have run up against something that we really can't/shouldn't do. I hoping this thread will be a way to talk about what we can't do (no judgement, please!) and figure out what we can do instead.
I'll start.
I can't run. I can't run because I have arthritis in both of my knees (the right one being the worst). I have deformed feet (unique is how my doctor described them) and as a result, my ankles are a mess. Much of the damage to my feet and ankles is irreparable. Running would cause even more damage and also hasten me towards the knee replacements I will eventually have to have.
So, I can't run. But I can walk (some, gotta be careful), ride my recumbent stationary bike and swim.
Next?