Just rotate it throughout your body. right glute, left glute, delts, etc.. Don't put any more than 2 cc's in a large muscle group and no more than 1 cc in smaller bodyparts. If you constantly inject in the glutes you will form a callus type object on the injection spot and you'll have an abnormally huge bulge on your ass. Also, when injecting in the same spot repeatedly, scar tissue builds up and causes muscle fibers to crossfiber, resulting in a weaker, more tear prone muscle. Hope that helps.