Monday I see a highly rated Urologist for a second opinion. I assume that he will want to check my PSA and schedule another biopsy. The day before I see him, I am planning to ride an 85 mile Dual Sport ride on my dirt bike. Much of the day will be spent on rough terrain with many rocks and roots. Do you know if the pounding your body takes can affect the PSA reading? The seat on a dirt bike is not plush like a road bike and my butt will be deeply sore for several days.