Glute bridges are a great, basic exercise for working the butt muscles.
Once you master the basic bodyweight version, it is easy to load up with weight.
Two common areas I see people going wrong with this exercise are:
1) Using too much lower back and hamstring during the exercise - Focus on squeezing the butt muscles hard through the exercise.
2) Being afraid to go heavy on this exercise. This is an easy exercise to go heavy with as the glutes are such a strong muscle.
•Lay on back with knees bent and feet flat on floor. Feet hip width-ish apart with toes facing away.
•Brace abdominal muscles and keep braced throughout exercise. Press upper arms into the floor.
•Squeeze glutes and lift hips up off floor. Continue raising until there is a straight line from knees - hips - shoulders.
•Avoid over-arching lower back during exercise and try not to use hamstrings during exercise. Work should be done by butt muscles.
•With control, lower back to floor and repeat.
This is my, mostly, Personal Trainer musings and information which I hope you'll find helpful!