At the moment, movement speed doesn't affect how much DOSE is earned but users must have their GPS turned on while playing the game. All the game requires is that users are active and are moving within the required speed which we call "proof of workout".
Users will get a message in-game notifying them when they are traveling either too fast or too slow. Note that energy will not be spent while users are moving too fast or too slow, thus no DOSE will be earned.
NOTE: We are constantly looking at ways to better our anti-cheat mechanism and will make changes as needed.