Working out is good for you. That's an empirical fact. I don't think it does anyone any favors to pretend that it's not. Obviously if you have injuries you should modify and scale workouts appropriately. But not working out is making a conscious choice to be less healthy. That's fine if that's where your priorities lie, but it's still a conscious choice to be less healthy, not simply a difference of opinion. It's much closer to choosing to smoke cigarettes than it is choosing to use a different text editor.