Hill staffers and PGA professionals mingle Wednesday at this year's National Golf Day event on Capitol Hill, which included an annual Democrats versus Republicans putting challenge. Emily Jan/NPR hide caption

itoggle caption Emily Jan/NPR

Performance nutrition experts recommend stopping at all the hydration stations for a quick fill-up of a sports drink to replenish the glycogen that's being burned during a marathon. iStockphoto hide caption

itoggle caption iStockphoto