In the fast-paced tech world, there is a race to develop the best software that collects more and more data. In athletics, this manifests itself through tracking systems like those that athletes wear to gauge even the exact steps they take. However, those devices don't measure anything about how an athlete actually feels. Enter John Cone, who wants to offer athletic teams a way to track subjective measures alongside objective ones. Called Fit for 90, Cone's monitoring system is already used...