How the high-tech sensors built for competitive athletes are solving medicine’s biggest blind spot in cardiac recovery. If you ride a road bike or train for marathons, you likely know the feeling of the "invisible coach." Platforms like Domesly pioneered the idea of a digital Directeur Sportif—a real-time audio companion in your ear. As you climb a steep pass or sprint through crosswinds, the software tracks your power output, heart rate, and cadence. Before your legs flood w