Eventually, everyone becomes a quitter at life anyways. The best we can hope for is to write Beethoven's Ninth.
Comes down to enjoyment for me. I don't mean every moment has to be ecstasy, and I've got a strong ability to endure shittiness to get a result, but I'm looking for activities (whether work or play) to be rewarding overall.
In most cases, I think parents involve their kid in sports because they:
1) want to get the kid out of the house,
2) think the kid will meet a better class of 'friends' in sporting circles (false),
3) have baggage and want their son to be a sports star.
These 3 for me, anyway. Only an exceedingly small percentage of kids are going to be athletically gifted, like pro level gifted, and should be pushed to develop that talent. Most kids get volunteered to sports rather than volunteering out of their own genuine enthusiasm. I never once said I wanted to do any of the sports shit they had me do. Little league. Soccer. Track. Basketball. Swimming ad nauseum, literally. Not one of these was I ever keen to join. Not one did I enjoy once I had joined. What a lot of stupidity.
So I'll see Shizzo's 'what if I stayed with sports' and raise him: What if I never wasted all that time participating in sports? If I had just said, "Doesn't sound like something I'd enjoy, so no, I won't be doing that." I would have been a far more developed and self-aware person if I had just followed my nose instead of the cacophony of activity I was constantly being shoved into.