@MammaT - My "devotion to exercise" is fairly recent. I was somewhat of a couch potato before I started having problems with first hip. Then onset was severe pain (at one point, I couldn't rotate that leg at all without pain so severe I felt like I would pass out). I found out later it was a femoral head "insufficiency fracture" but wasn't seen on x-ray or diagnosed for a year. After the worst pain improved, it just gradually got worse and worse (as the collapsed area of bone was scraping away the cartilage) and I started doing less and less. My doctor was always on my case about needing to exercise and couldn't understand that I couldn't without making the pain too intense. She thought it was just bursitis but I knew it wasn't because there was no external pain. Along the way, she sent me to PT and I lucked into someone good. At one point, he was the one advocating for me and indicating in his report that there appeared to be a problem with the joint.
When I finally found out what was wrong and got the THR, I went back to him for PT. Between PT the summer before and after the THR, and discovering a mild heart condition during my post op testing (to go along with my mild case of diabetes), I knew I had to get serious about "maintenance" of my body if I wanted to stick around long term.
So, when PT done after first THR, I joined a gym and started working with a trainer. I also joint a group that goes out dancing to rehab the hip and get some fun exercise. I lost 20 pounds and got into OK shape. I tried to keep going as much as I could when the second hip started barking. At pre op for that hip, my doc made huge adjustments in Ned because of how well I'd done.
So, short story long, that's the reason I've pushed myself so hard after surgery. As long as it wasn't causing pain and setting me back, I'm determined to get back where I was as quickly as possible to not give back too much ground from a health standpoint.