Don't want to publish all the details about your training? Upload without heart rate, power, cadence data.
Explore segments and the current wind conditions.
Get your activity in FIT format for great interoperability.
You can find the list of supported sensors here.
FIT, TCX, HRM activities can be imported.
Polar Personal Trainer
As an endurance athlete, I have always missed certain features from activity tracker solutions. Now I'm implementing those myself.