The thing is I see a lot of people in my life who would be happier if they did a little "self-improvement". When it is just about having something to do, it may be a bit annoying to those not into it and who then get preached - but it does help, IMO, if done in some manner and I don't see a reason why there was anybody who wouldn't benefit, in principle. In reality, the day of course only has only 24h and so forth. I have no children, no wife, no full-time job. I got the time and it does a good service to me. :shrugg: An if others can find the time and energy and the other option is watching TV, they would benefit as well. The human body isn't such a mystery to have to wonder about that. But you would need to find a way to look forward to it. If it would jsut be constant mysery it perhaps is not worth it. But once you see sport for its own sake, that really is not hard and IMO everyone could. Its in our nature. Doesn't mean you have to obsess with it.
edit: But I think I get what you mean. Self-improvement for its own sake truly reeks very bad. Like one just found way to hide oneself from oneself and be smug about it.