I got a clear steer from TR eventually last summer that I should now be testing in the aero position but I’m still not quite convinced. Not sure what’s different this year, perhaps it’s just more training over autumn/winter, but I’m definitely feeling weakness when in aero.
That said, I don’t know what I’ll do with the results. I guess I just want to see how big the difference is. It’s been a while since I analysed my fit, so I may rework that.
I’m still alternating aero/upright in the training sessions for the endurance rides. Interval sessions I do in aero until/unless I can’t then I’ll sit up and easily finish the session.