Yeah, lower extemity issues can obviously limit activity. I'm pretty fortunate in not having anything chronic. I still have muscle pulls, baseball is really bad for that. This time I pulled an adductor running sprints, to get ready for baseball. I rested it ten days, and tried again, and it went out again, even barely jogging, just a few days before baseball. So, I was limited to having a runner, which I hate, but the trainers did a fantastic job with me and I was running fine the last two days.
Every year I seem to find another muscle group that tweaks, and then I try and get it conditioned, and then another one goes. I have about 100 groups now I'm working on.
My arm is holding up now, rather amazingly considering. It used to go dead after a few days of throwing.