i give mine their own day, and i hit them a bit on my chest and back day. i usually just do 2 or 3 burn out sets at the end of my workout and thats all it takes to pump them up, burn them out and make them sore. im on cycle right now and trying to get some major arm growth out of it. there have been times when i dont have an arm day in my workout and ive never seen it make affect the size of my arms, but they also didnt grow a lot then either.