I have such a problem with the fitness age metric.The determination of fitness age is influenced by BMI, resting heart rate, as well as the number of days of activity and the duration of activities. So, since I started working out according to the Garmin recommendation plan, neither the days of activity according to this plan nor the minutes of activity (which should be at least 75) are for some reason not taken into account. That is, only the activities that I record outside the Garmin plan are taken into account. Although before that, when I trained according to other Garmin plans (for 21.1 km., 42.2 km.)There was no such problem. Maybe someone has encountered this problem, knows how to solve it.