Runkeeper:
- Sends your activities (duration and number of calories) to your Withings account.
- Receives your number of steps, your weight and fat mass measurements, and your blood pressure measurements from your Withings account.
https://support.withings.com/hc/en-us/sections/6216083667217-Partner-Apps
https://support.withings.com/hc/en-us/sections/360005803793-Features