While promoting his book, the master shared some of his sculpting tips with Shape and suggests doing a variety of moves, like sumo lunges, platypus walk, and plié squats. To see what he recommends for people who worry about their quadriceps becoming bulky while strengthening and shaping their booty, read more.
Kirsch told Shape that anyone worried about bulking up their quads should stay away from traditional squats and explained,
They're going to [want] do a wide-stance squat or a plié squat, which is second position dance, opening up your legs and bringing the focus to the inner thighs and not to the quads. Don't use excessive weight and keep repetitions high. I use body weight or a medicine ball or light hand weights.
There you have it, from the master himself. Would you buy his book that's all about achieving your ideal booty?