Losing just 2% of body weight through sweat is enough to measurably hurt performance, and that's an easy number to hit on a hot practice day, often before a runner even feels thirsty.

Suggested Middle school summer training isn't about mileage. Here's what actually matters for 6th, 7th, and 8th grade distance runners right now.

A youth running program in Indiana built on the Norwegian model: no cuts, no rankings, just kids who fall in love with running for life.