Her clenching butt muscles looked hard enough to crack walnuts.

Hold a 5-8 lb dumbbell with both hands down in front of one thigh; tighten your butt muscles.

"To start off from a three-point stance, you have to develop your butt muscles," he said.

Pull knees toward chest to feel the stretch deep in your butt muscle.

B. Lift right leg until you feel your butt muscles flex, then slowly lower it back down.

Soften knees, tighten butt muscles, hinge slightly forward at waist.

Yeah, clouds that move when the butt muscles flex.

Use the butt muscles and thighs to push and pull your lower body back and forth.

Pause, tighten butt muscles and rise back up.

When legs straighten, thrust pelvis forward, squeezing butt muscles again.