No matter what I do, I can't put any mass on my glutes. It remains flat and I've tried different routines. I currently do 3-4 sets of lunges in the 8-10 rep range and 3-4 sets of step ups in the 10-12 range. I've tried using more weight and less reps as well. Anyone have any suggestions on how to work these succesfully and get them to grow? Thanks.

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