Get down on your hands and knees.

Steadily lift the right leg up until the thigh is parallel with the ground, focusing on the right glute doing all of the work. Pause at the top for 1-2 seconds.

Slowly return to the starting position.

Add resistance with the use of a band. Have the band below one knee and above the other. The leg with the band above its knee is the leg that is doing the work.