Considering the limitations of dumb trainers, is it truly worthwhile to invest in a cadence sensor, and if so, how can its data be effectively utilized in a setup thats not integrated with smart trainer technology? Specifically, what methods can be employed to accurately calibrate the sensor and ensure its output is reliably synchronized with the trainers resistance, given the lack of electronic communication between the two devices? Additionally, can the data from a cadence sensor be used to create a more engaging and structured workout experience on a dumb trainer, despite the trainers inability to adjust resistance in real-time?