Single Leg Plank
Another plank variation, great for hips and glutes.
Lay down on the floor with your belly to the ground. Align your elbows directly below the shoulders and ground the toes into the floor. Lift your body up and align your butt, upper back, and head in a straight line. Keep a neutral neck and spine.
With your legs hip-width apart, lift your right leg to hip height and hold as much as you can.