I have a stent in my chest. I had that because (I suppose) I went to California to manage a large marina there - and I had left my mountain bike back in Denver in storage. I have my magnificent Lady Xizang with me now, and intend to keep her with me through the bitter end. No way do I ever want to be without my bike again!
I also learned that nothing creates energy better than using energy. I go out for a decent bike ride and come back - I may be tired, but I'm wired and often do my laundry, dishes and other chores, before finally laying down to take a nap. And as long as I can ride, I don't get depressed. Great physical and mental therapy, that GT Xizang.