Evening. Been on my turbo trainer quite a lot recently. Linked to my Garmin 520 and Vivoactive3 watch, it gives me various fields of data including power, which according to Strava comes from a power meter (see pic). Now I do have a power meter (Stages 1) but that is on my TT bike. The strava data is quite clear that it's not an estimate, so where is this coming from? Does my Tacx (Flow, I think) measure power? Any suggestions will be warmly appreciated.