I know this probably isn't a real concern, but I'm a paranoid sort of person so bear with me for a moment.I've noticed that when I do a just a couple of arm exercises, the veins in the my left wrist and upper arm bulge out painfully. It's only in that one spot and on that one arm, and I find it a little concerning. Is it because I'm doing something wrong? Am I cutting off the blood flow or is the flow in some other way constricted? Is this something that could cause problems? Thanks.