I battled side stitches for the final 6 miles of yesterday's long run — 76°F, 92% humidity, dew point 72°. Here's what was actually happening, and why I'd do it again.

Your training brain is built to never be satisfied — and that's exactly the point. Here's what happens when ambition meets community.

The first miles are hard for every runner at every level — and it's not weakness. It's your brain doing exactly what it was built to do. Here's the science behind it.

Solo training builds fitness. Group training builds fitness and something else — a pull toward the work that's hard to manufacture on your own. Here's why.

Going into Chicago chasing sub-2:30 at 110+ miles a week, one shoe can't do every job. Here's the full 5-shoe rotation and the logic behind each one.