The glute bridge is a basic glute exercise accessible to anyone that allows no to heavy loading and several variations.
 
Lie on your back and bend the knees to bring the feet flat on the floor close to the glutes. Push the heels through the floor and keep the abs tight to lift the hips as high as possible, focusing on pushing the hips up by contracting the glutes. Lower under control and repeat.
 
Add weight with a barbell or dumbbell across the hips.
 
Purpose
The glute bridge is an easy way to perform baseline glute work to extend and stabilize the hip, or overload hip extension with a focus on the glutes and minimal loading on the back.
 
Programming
Weighted glute bridges can be done at the end of a training session with trunk and accessory work in 3-5 sets of 5-10 reps. Reps as high as 30 can be done as well, or done as isometric holds of 10-30 seconds. Unloaded bridges are often used in a warm-up to help prepare the hips.

Variations
The glute bridge can be done unilaterally, or with the upper back supported on a bench or similar to extend the range of motion somewhat and increase the difficulty slightly (often this variation is referred to as a hip thrust). It can also be done without allowing the hips to touch the floor between reps to maintain continuous tension.