A dead post recommended me "Start lifting weights". Sorry, I can't. I have osteo-arthirtis which doesn't let me lift. I can and love running though. It is not

A dead post recommended me "Start lifting weights". Sorry, I can't. I have osteo-arthirtis which doesn't let me lift. I can and love running though. It is not that I don't want to, but when feeling this terrible, I can't move from bed.