iRunFar’s in Basque Country, Spain, for the 25th anniversary of the Zegama Marathon on Sunday! Read our preview of the blockbuster field and follow our race-week live coverage.

breathing

By Corrine Malcolm Comments

A look at the non-asthma breathing problems that occur during endurance running.

By Tracy Beth Høeg MD, PhD Comments

An in-depth report from the 2015 Medicine & Science in Ultra-Endurance Sports Conference held before the 2015 Western States 100.