These 9 Booty-Gain Before and Afters Are Serious Goals

Bikini competitor and fitness expert Marta Mielczarska, NASM, CPT, FNS, shared her booty transformation on Instagram and revealed that in order to put on muscle, you have to eat more. She told POPSUGAR that she was eating 1,800 calories on the photo on the left, but was up to 2,200 calories on the photo on the right.