During the plan build cycle, the system uses multiple phases to create candidate plans. One of these phases limits changes within your Plan Horizon to only adjusting existing workouts. For example, if your Plan Horizon is set to 7, the scheduled running and rest days for the upcoming 7 days are locked in; only the duration and type of those workouts will change (the extent of which is controlled by your Variation Tolerance). This helps maintain consistency in your immediate training schedule.
