if you can get over everyne calling you gay, yoga is a wonderful exercise. it is NOT a sport. there is no competition. yoga is about finding physical and mental balance and strength. it is about stretching and breathing, and it is hard as hell to do. but you get better very quickly, and it can be very rewarding and relaxing.
i've never been in better shape than when i went to a yoga class three times a week. also, it's a good way to met girls (even though they'll think you're gay at first).
also, the position you see at the top is BEYOND advanced. you're not expected to do crazy shit like that, ever. most yoga exercises actually remind you of Phys. Ed. as a kid.