More to explore:
Hip Flexor Stretch and Glute Activation Drill
by Kitty8Tim on Youtube
Glute Activation and Hip Mobility Drill
Hip flexor stretch
Hip Thrusts and Glute Bridges
Hip Flexor and Hamstring Dynamic Warm Up and Stretch
Best Butt Exercises : Hip Thrust target your Glutius Maximus Explains Glute Bridge vs Hip Thrust
Hip Thrusts for a Tight Butt - Training
Everything You Need to Know About the Hip Thrust: Ladies all want to know how they can get a great ass. Here you go, from Brett Contreras, "the glute guy" himself. I can attest to the effectiveness of heavy barbell hip thrusts.
The PPTHT (Posterior Pelvic Tilt Hip Thrust). How I can prevent my hammies taking over when preform hip thrusts.
hip-thrust for better booty
Dropping Some Glute Knowledge Strong Hip Thrusts--also works without that much weight. =)
For Firmer, Bigger and Rounder Glutes, try hip thrusts