Personal Trainer tips: Really focus on squeezing the glutes at the top of the motion and move in a slow and controlled manner. (best-leg-exercises.com)
Raise your hips toward the ceiling focusing on squeezing your glutes while drawing your belly button in. (byrdie.co.uk)
Drive your knees out, then drive your hips up into extension by squeezing your glutes hard. (fitnessandpower.com)