In 1996, I spent 2 months training at 10,000 feet in Toluca, Mexico. My gracious host was two-time New York City Marathon champion German Silva. (If you think German is a fast runner, you should see ...

But what’s the secret to Kahler’s speedy performances? He says it’s a simple ingredient he adds into his training formula each week: Strides. Ready to pick up your pace? Explore how you can unlock new ...