My gf and I have been trying to conceive for >1 year now. We recently visited an infertility clinic for a full work-up. I have been told that both the quality and number of my sperm are extremely low. My gf suspects that my high mileage (140 mpw) is having a negative effect on our ability to conceive. Does anyone have experience with infertility and the impact (or not) of running on sperm quality?