Stryd, the company that pioneered the idea of power meters for running, recently published a scientific white paper called “Running Power Definition and Utility.” That might seem like an odd topic for a company that’s been selling power meters since 2015. You’d figure they must know by now what running power is and why it’s useful. But these questions are far knottier than you might think, and Stryd has always been fairly forthright about admitting this. In Outside’s initial coverage of their launch, one co-founder said their fundamental challenge was “lack of knowledge,” and...