The standard activity types for every challenge are Walk and Run. Our support team can assist you in enabling additional types such as Cycle, Swim, Other, etc.
These types are used when a user manually enters their activity (as shown in the screenshot below), allowing them to indicate what form of activity they were doing. The system does not account for the "effort" involved: 5 km of walking adds 5 km of distance to the challenge, just the same as 5 km of cycling.
It's important to note that our connections with syncing devices (eg. Fitbit, Garmin, Apple Health and Google Fit) will still only sync the participant's steps.