Single leg glute bridge, cross-legged

Lie on your back with your head supported on a pillow.
Bend one leg upwards, placing the foot on the floor.
Draw your other leg up and cross it over the bent leg.
Lift your hips up into a bridge position until you have a straight line from your shoulders to your knees.
Hold briefly and then lower back down and repeat.
Keep your pelvis level throughout this exercise.