It's easy to start running. Without a coach, it can be hard to perfect. Nurvv's Run smart insoles boast 32 sensors that track technique over 1,000 times per second. As a result, the companion app is able to give real-time coaching during training runs. It tracks cadence, step length, foot strike, and more, and can coach based on a target pace or personal best for a given route. At the end of each run, it also provides a running health score, an indication of how sustainable the wearer's running is based on training load, pronation, cadence, and asymmetry.