A 2025 Sports Medicine review argues Zone 2 training may not be uniquely optimal for building mitochondria. Here is what runners should change and what they should keep.
News
Ultrarunner Pablo Espinosa Was Sent Home to Die. He Chose Clinical Trials, and He Is Still Lacing Up
Ultrarunner Pablo Espinosa was placed in palliative care after a stage-four cancer diagnosis. He is now in an experimental trial, and his message is one line: one step at a time.
News
A Spanish Mechanic Started Running at 66. At 82 He Has the VO2 Max of a 20-Year-Old
Juan López García began running at 66 and could not finish a mile. At 82, he holds the world 50K ultra record for his age group and a VO2 max never seen before over 80.
News
At 67, She Became the First Woman Ever Over 65 to Break 3 Hours in a Marathon
Josh Kerr ran 3:42.66 at the London Diamond League to break Hicham El Guerrouj's 27-year mile world record. Inside the race, the splits, and what it means.