Yoga. I've been practicing yoga for more than ten years now. It does all of the things it's supposed to do: it centers me, it makes me stronger, it makes me more flexible, and it humbles me. I prefer my yoga slow, calm, and thoughtful--and these are all qualities I seek in myself, as well. I'm inspired when I see 75-year-olds in class, because I know that if I keep practicing, I'll be able to get myself into Adho Mukha Svansana (Downward-Facing Dog) for years to come.
Y is also for "Yippee, I'm almost at the end of the alphabet!"