A variation on the glut bridges, adds resistance with an exercise band.
Lie down on your back on the floor or on a yoga mat. Double-up the exercise tube. Place it over your hips, holding the tube against the floor with your hands.
Exhale and push your heels to lift your buttocks off of the floor. Keep your core engaged at all times. Avoid overarching your low back and also avoid shrugging your shoulders. Inhale and slowly lower your buttocks back to the floor. Try to keep your gluts engaged the whole way down.
Repeat the exercise 8-12 times, rest, then repeat the entire exercise if desired.
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Thigh and Buttocks Muscles with the Exercise Tube