Glute bridge

The glute bridge is one of the best exercises for targeting the glutes (gluteus maximus), while also activating the hamstrings, core, and lower back. It’s excellent for building strength, improving hip mobility, and helping with posterior chain development.
How to Perform a Basic Glute Bridge (step-by-step)

Lie flat on your back on the floor (use a mat for comfort).
Bend your knees and place your feet flat on the ground, hip-width apart, about 6–12 inches from your butt.
Keep your arms relaxed at your sides, palms down.
Engage your core (think of pulling your belly button toward your spine).
Push through your heels and squeeze your glutes to lift your hips off the ground until your body forms a straight line from your knees to your shoulders.
At the top, your shins should be roughly vertical, and your glutes fully contracted (avoid overarching your lower back).
Pause for 1–2 seconds at the top, really squeezing the glutes.
Slowly lower your hips back down with control (don’t just drop).
Repeat for desired reps.