Diego Calvo, the trainer of the 'celebrities' of Los Angeles, reveals his favorite exercises to give volume and raise flat and sagging buttocks. "Those of us who are genetically designed to 'not have' an ass (and I put myself in that bag) have to train our glutes very intensely to give them a little volume," says Diego Calvo.

Calvo clarifies that "the deadlift and the hip lift have to be two fixed exercises in both sessions"