I took riding lessons as a kid, and then volunteered at a therapeutic riding facility, which turned into summer jobs at the same facility. Then I moved, and moved again, and I lost touch with horses for almost twenty years.
My sister in law got me some riding lessons for Christmas two years ago. Best present I ever got. Most expensive present I ever got, in terms of what it's cost me, but still - great gift.
Riding as an adult is so different from riding as a kid. When I was young, everything was physical - playing to my strengths, I guess. Now, it's more technical, more theoretical, and, to my mind, much more intense. As a kid, I rode hunter/jumper, and that's what I started with as an adult, but I found a horse that could teach me a lot if I could just stay on her (bit of a shying/bucking/silliness habit) so I switched to western for a better grip. And it's been fascinating.
PS. Four of my five novels so far have been set in the horse world, so I'm seriously thinking of trying to write off at least 1/2 of my lesson and leasing costs as a business expense. People can do that for taking clients out for dinner, so shouldn't I be able to do it for something that I enjoy, but that is also good for my work? Has anybody tried this? (I'm in Canada, so Revenue Canada input would be most valuable).