I've been lifting weights for quite a while - about a year. Just lately though I have been experiencing headaches - bad throbbing headaches - brought on by lifting weights. I don't understand why I am getting these now, especially since I'm used to lifing weights - I'm not a newby. It started last week, and has been happening everytime I lift now. And it doesnt' matter what I'm doing - benching, squating, or even pushups, I get the head throb right off the bat. Never happens during cardio though. Anyone else experience this out of the blue - is this just exhursion headaches? If so, how do you prevent them?