Running & headbanging just don't mix

I discovered last night that running & headbanging don't mix. It is very hard to headbang & run (at least on the treadmill) at the same time. I kept getting disoriented each time my head would come back up. Then my feet want to run to the same rhythm my head was banging to & that doesn't work so well either. I am surprised I didn't fall flat on my face & fly off the treadmill! So just as a warning to all you metal headbanging runners out there. Don't try to do both at the same time!