You almost never hear of a DC Watt Meter – one just does some mental math with Volts and Amps at the back of one’s head. An AC Watt Meter, on the other hand, can by pretty useful on any workbench.

There’s a new performance measurement tool for runners on the market, and I predict that it’s going to dramatically evolve the way we train, race, and perform down the road. It’s called a running ...