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Perhaps try stretching on the bike, I discovered that if I stretch briefly but often then I can hold an aero position for longer
I got this idea from listening to your interview on the 24 last year. I now set an alarm for every 20 minutes and use it for stretching (as well as eating / drinking). It helped me a lot during the TCR, so thanks!
Also I agree, those interviews with Wilko are very useful.
Watch this series of videos:
https://www.youtube.com/watch?v=Z9g_g73Iqeg&t=2s
Also, practise riding at night with your race kit on etc etc - it's surprising how quickly pot holes come up on you in the dark. To back up what @hippy said, i'd go for aero bars - free speed plus more variety of positions even if you just have clip ons. Perhaps try stretching on the bike, I discovered that if I stretch briefly but often then I can hold an aero position for longer.