Live coverage of the 2018 Hardrock 100.

The science of altitude acclimation for endurance running and other outdoor sports.

A video interview (with transcript) with Troy Howard before the 2018 Hardrock 100.

A video interview with Jeff Browning before the 2018 Hardrock 100.

This Week In Running’s trail and ultra recap for July 16, 2018.

A video interview (with transcript) with Xavier Thévenard before the 2018 Hardrock 100.

A video interview (with transcript) with Sabrina Stanley before the 2018 Hardrock 100.

A video interview (with transcript) with Kaori Niwa before the 2018 Hardrock 100.

An essay about the benefits of choosing to do hard things.

A discussion article about the results of iRunFar’s Trail Running and Safety Survey and how we solve our sport’s human-safety problems.