Running withPower

Training on heart rate is fine, training on pace works too, but training on power is the next step for runners.

Every coach knows it: heart rate skews with heat, fatigue or stress, and pace skews with wind or hills. Power (watts) doesn't skew.

Cyclists have been training with watts for years. In running it's still relatively new ground, and whoever dives in now will soon have a head start on the rest.