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The Denver Colfax Marathon is proud to contribute more than ever before to local nonprofits through its one-of-a-kind charity program which has yielded over $10 million to local charities through the years.

Recent research has revealed that weight training may provide significant protective benefits for the brains of older adults, especially in those at risk for cognitive decline, such as individuals with mild cognitive impairment (MCI).

Qualifying for the Boston Marathon is about to get tougher. On Monday, the Boston Athletic Association (B.A.A.) announced it will introduce time penalties for runners who qualify on net-downhill courses with significant elevation drops.

Stack Endurance and GameDay Run Series are excited to announce that registration for the much-anticipated 4th Annual Denver Rocks Run 5K/10K is officially open. Coming off a record-breaking year in 2024, Denver Rocks Run is set to welcome runners back to City Park on September 7, 2025. This race combines the excitement of a competitive run with the unique charm and excitement of one of the city’s most iconic parks and historic MLB franchises.

USATF Colorado has announced the return of the USATFColorado Grand Prix for 2025, featuring a refreshed six-race series, an innovative “home meet” format, and a total of $10,000 in prize money for top-performing clubs and individuals.

Thule Inc. has told state officials that it will layoff 22 workers at its facility in Colorado in October. The facility has a total of 40 employees currently.

IRONMAN announced today that it will host the first IRONMAN® branded event in the state of New Mexico with the IRONMAN® 70.3® Ruidoso New Mexico triathlon. In addition, the new event will be a part of a festival weekend of racing, which will include the 5150® Ruidoso New Mexico triathlon and Ruidoso Sprint triathlon, and is scheduled to debut on July 11-12, 2026.

Denver welcomed over 25,000 runners to the Mile High for the city’s largest running event of the year.

After a one-year break, the Aspen Backcountry Marathon is officially making its comeback on Saturday, August 2, 2025.

The London Marathon has received more than 1.1 million applications for the 2026 race, breaking the world record of 840,318 set in last year's public ballot.