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

If you drove up to Breckenridge or Leadville for a trail race last summer and noticed that your legs felt heavier and your lungs worked harder than the effort should have required, you were not imagining it. Running at altitude above 5,000 feet creates physiological demands that flat-land training…

The American College of Sports is a professional organization for sport science researchers, educators, exercise physiologists, sports dietitians and doctors. At ACSM's Annual Meeting more than 4,500 members from around the globe presented their latest research.

USATF Colorado has announced the return of the USATF Colorado Grand Prix for 2026, featuring a dynamic six-race series, a continued “home meet” format, and a total of $10,000 in prize money for top-performing clubs and individuals.