I have nothing against running as a form of exercise, but let's not pretend it builds muscle optimally or is in any way, shape or form conductive to good joint

I have nothing against running as a form of exercise, but let's not pretend it builds muscle optimally or is in any way, shape or form conductive to good joint health. It's a repetitive, low-ROM, impact-based sport. It's fun and rewarding and good for your circulation or burning massive amounts of calories, but that's it. Bodybuilding (done properly) is about as close to perfect for maintaining a functioning body into old age as you can design an activity: It's easily scalable from zero to infinity, has regression and progression to your abilities built in, and huge benefits from even the smallest investment. It can be performed with basically no impact. It improves joint health. It helps you train to perform every day activities. It can easily be modified to cope with injuries, missing limbs, whatever limitation you have. It benefits you hormonally in a massive way. etc etc I'm 36. I do about 14 hours of tennis/surf every week, plus maybe 2 hours of gym work and lots of moving around during the day for my construction work. I love my sports but my body would be a wreck if it weren't for the resistance exercise I do to prepare/rehabilitate it. I would do a lot more of it if I were smart.