An Action is defined as anything with an uncertain outcome that requires a Check to resolve. Sometimes even moving may require a Check, such as attempting to leap a chasm in the middle of combat, or navigating a slippery surface. In some of those cases, perhaps a successful Check made for movement on a player's turn will award them a bonus Action to take, such as if a player wishes to make a leaping attack, as merely one example. The gamemaster/storyteller is encouraged to reward clever and daring play and players are encouraged to ask if a successful movement Check might offer them a bonus Action on their Turn.