You need to keep your glute muscles active all the time to keep your booty lifted and shaped nicely. I add booty work 4 sometimes 5 days of my workouts. For example, in between my workout today I did kickbacks and abduction machine ( hover ) both high reps and light weight. Yesterday, I did heavier weighted glute work - like low sumo squat pulse holding a 65lb db. I switch it up and usually do 1-2 heavy days and 1-3 light days with all workouts to make sure I keep it high and tight!