Indoor Bike or Spinner features
That's basically it. That it take cadence sensor data via Bluetooth, HR Bluetoothed data, logged mph data, and thus "speed" is calculated. Having a "power" field is also welcome because resistance is impossible to capture, but power can be. Then, you don't need a charged phone when you just feel like a good ride. You just change your shoes and pop on an HR strap.
Thank you for your consideration.