OK so all my cycles i have used the glutes upper and lower both sides.. as rotation spots. Now i want to throw quads in I have treid this twice before.. but each time i had a really hard time pushing the needle all the way in, its like my muscle is tight and the needle will only go half way in. I want to get use to Rotating so i can take a tren cycle after this one. So I want to get good practice shooting my deca/enth in 4 different spots, can you guys throw some tips in on how your shoot your quads, are you standing laying down pushing in slow? pushing it in fast???