In fact, the saying goes that your bikini body is built in the winter and spring which means that now is the best time than ever to start thinking about getting in good shape. And although squats, lunges, and cardio can do wonders for slimming down your body and tightening up your butt, Dr. Gregory Wiener has two different butt augmentation procedures to consider before summer. During this surgical procedure, Dr. Gregory Wiener will use liposuction to harvest fat from other areas of the body like the upper thighs or abdomen.