Walking lunges (or any kind of lunge), hi-hip deadlifts (also called Romanian deadlifts) , hip abduction machine with your butt off the seat, glute kickback machine and lots of others you can find videos of online. 2 really good trainers are Charles Glass and Hany Rambod who both have a very strong online presence. 3 things to remember: 1) Muscles don't grow without progressive resistance, 2) Once you get over about 15 reps per set you switch over from anaerobic to aerobic and 3) When you do these type of multi-joint, core involved exercises you can easily thicken your abdominal wall which makes your gut bigger so wear a weight belt. Good luck!
Okay. Lunges too.
Yay! I've been focusing on squats too. Tired of flat butt syndrome ?
Me too.