I have an iPhone 6s. It automatically records steps and walking distance in the Health app using the M9 motion coprocessor with very little battery impact. How can I record cycling distance like this? All the apps I find on the App Store for cycling seem to use GPS, which drains the battery quickly.
I should also mention: After cycling, the Health app shows an increased number of steps, but I have no idea how cycling mileage correlates to step count.