Female distance runners improve health - and speed - with better

Stanford Medicine researchers find that with improved nutrition, female runners suffer less injuries and improve health overall.

Why too much running is bad for your heart

How To Run Faster: Speed Training Workout to Develop Top Speed - Performance Lab of California

What's the Average Running Speed and Can You Improve Your Pace?, by David Runners Blueprint

Speed Work for Middle Distance Runners from Professional Running Coaches

Effects of Running on the Female Body (by a Medical Doctor)

This One Thing Will Improve A Runner's Performance Big Time — Eat This Not That

Does Running Boost Testosterone?

Can Speed Work Really Improve My Distance Running Times? - St Pete Running Company

Average Marathon Running Times and Race Statistics