I have a Spark 3 watch since May. During this period I run only twice, because I have problem with my knee. I daily performs at least one of other activities such as: cycle, indoor cycle, gym, freestyle (walking). Total 354 activities, over 343 hours active time, near 2000 km distance etc. And all I can see is that the TomTom Sports calculates my Fitness age and VO2Max only for that 2 run activities (the first one in May and the second one in August).
My fitness advisor says: Remember, Fitness Age is more accurate if you run occasionally. Go for a short 10 minute indoor or outdoor run once a month.
It means that the Fitness Age should be calculated from the other activities, but currently it isn't calculated completely. Is it a correct behavior?