I got buttock fat from sitting so much in the past and I want to get rid of it too. When I sit down, you can notice I have exta fat or whatever on the sides and I do not like it. I am not fat or anything, but I have a little fat in the butt from sitting a lot in the past without getting up for breaks. I need to start doing glute bridges and clams, and also lunges, deadlifts, hip flexor stretching, and squats. I also have anterior pelvic tilt. I need to stop being lazy and start getting my glutes sore. It's always better said than done.