Hi there, I have a just bought a Tacx Flux S TT and have had a Garmin 735XT for a while now. When I do a turbo my V02 max does not move. Essentially it plummeted to 36 when I first started using it and has not moved since. There appears no evidence that it is actually recording. On the garmin site it says that I shouldn’t run measurements on two devices simultaneously so am not sure whether I should therefore not be using my garmin watch at the same time as the TT but then technically am not therefore recording my heart rate? I wonder whether my 735XT is too old or should that be directly synced to the flux s? Alternatively am I just missing something really obvious! Any help anyone can offer would be much appreciated. Many thanks