Colorado Runner - Colorado's running news, events and results source

On a crisp fall morning in Seeley, Wisconsin, more than 250 runners headed out at the Birkie Trail Runs, site of the USA Track & Field (USATF) Trail Running Championships. In order to combat the near-freezing temperatures, race leaders set a blistering pace in the early miles.

Jason Schlarb won the ultra-competitive Run Rabbit Run 100-mile race in Steamboat Springs for a third time with a finish of 18:48:08. His previous wins were in 2015 and in 2013 when he set the course record with a time of 17:15:20, which still stands.

Vitamin D is an essential nutrient that regulates some 1,000 processes in the body, and doctors have long known its importance to bone density and preventing the related illnesses like rickets and osteoporosis. Now researchers are beginning to study its role in athletic performance. While an extra…