One dumbbell. What leg/butt workouts work best?

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I do squats, weighted pelvic thrusts and calf raises. Are there any other moves that I can do with just a single dumbbell? I'm trying to really step up the weight-training. Also, should I adjust the dumbbell to the highest weight it goes(it's a nike adjustable. The highest weight is 25 lbs)? Or work my way up to it?

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