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.

It's been 100°F in Philadelphia with brutal humidity. Same training, same mileage — but this week I ate 12.5% more calories than last week and still lost weight. Here's what that reveals about fixed calorie goals and real energy demand.

Finishing a marathon isn't about being fast. It's about who you become in the process — and why that changes everything.

The Tokyo Marathon just raised its winner's prize to $170,000 — the biggest in World Marathon Majors history. Here's how that stacks up against what Soto, Mahomes, LeBron, and Ronaldo make.

My goal was to lose half a pound. I gained 0.3 lbs. My coaching system predicted it before the scale confirmed it — here's the math.

Heavy lifting and marathon training don't mix — but that doesn't mean strength work disappears during a block. Here's what stays, what waits for the offseason, and why.

Most runners figure out their fueling plan close to race day. Here's the math behind fueling a 15-mile cutdown exactly like race day — and why that rehearsal matters more than the plan itself.

The wall isn't physical. It's mental. Here are 26 mental tricks — one for every mile — to get you through it.

The marathon isn't just a longer 5K. It's a completely different race — and understanding why changes how you train for it, fuel for it, and race it.

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.

Most nutrition plans weren't built for running — they were borrowed from general fitness and applied to a sport they were never designed for. Here's the system that actually accounts for the sport.

Emergency porta-potty stops at mile 4 aren't bad luck. They're a pattern — and once you understand how your gut actually works, you can fix it.

Traditional calorie tracking has blind spots most people never see. Here's where your deficit is actually disappearing — and how Metabolic Running accounts for the noise.