Do any of you ski? If so, check out the article in the Washingtonian where I name the best strength training exercises for skiers and snowboarders. The single leg squat (seen below) is just one of the 5 exercises that will improve your skiing skills and skiing technique.
Heck, if you just want to improve your back side then this ski workout is for you. If you’ve got the goods but they could use a little lifting/shaping/reordering, then do the exercises I list in the article. All of the exercises target the legs and the booty. What more could you ask for?