This is a bit of a zombie thread, but I think it's an interesting topic.
I grew up on horses, and while I had to work at it and take lessons, it was something that came fairly easily to me and I was a pretty decent rider and eventually trained horses as well. I always did better with the more "sensitive" horses than the plod-types as my calm demeanor and light touch worked well.
Eventually I started riding motorcycles, and that very quickly became my passion. Talk about a Se activity though - you are living life completely in the moment with thoughts only a few moments in the future other than maybe planning a pass on LOL. Small mistakes can have big consequences. This is NOT a sport that came to me naturally, however, as every little thing I've learned, every second I've gained has been through much struggle, study, tears, mistakes, blood, money, money, money lol.
What I do know is that riding (street or track) is my stress release and gets me out of my own mulling mind and forces me to be in the moment. This seems to provide a fair bit of clarity for me quite often as it allows my Ni to process through things without my conscious thoughts getting in the way. I come out feeling more in control of life, and my mood remains stable. It's pretty much a need for me at this point as other activities (outside of maybe horses) simply don't have that same effect.
It also has the effect of making me realize and engage in life NOW, not life in my head. There's something very freeing about that....
I enjoy the competition (horses and now bikes), I'm one of those people who isn't going to watch a sport unless I'm actively participating in it, and even then, I'd rather do than watch. Never really got into team sports though, as I much prefer my progress (or lack thereof) to be mine and mine alone. I want to compete, and yes, I want to win, but I'm relatively patient and can take my time getting there.