Advice on Staying in the Aero position longer?

Hey, I'm just wondering if anyone has any advice, drills, exercises or whatever to help me stay in the aero position on my bike for a longer period of time. I just finished a half Ironman and by about the 70 km mark of the bike ride my back, shoulders and neck were really sore and I had to keep coming up to the bull horns to stretch every couple of minutes.

I ride with a fairly aggressive position but I'd rather get my body accustomed to that than go more upright with the bike fit. So if anyone has anything that has worked for them in this regard I"d love to hear about it.
Cheers, -Chris

Your bike should be more comfortable in the aero position then any other, which would suggest your bike fit is all wrong.

Did you get a professional fit?

I'm no expert by any means, but it could also be that you just need to work more on your body, rather than bike fit? There are plenty of exercises which can help you improve both strength and flexibility in back, shoulders etc which should 'condition' you to stay aero for longer. I've seen a few posts on the 'net lately spefically on upper body conditioning for bike (to address sore lower back etc etc). Hope that helps.

(I myself have a niggling ACJ injury which has led me to compromise my aero position so that I can hold it longer while I rehab the shoulder - you can see in my avatar pic that my elbows are slightly wider than would be ideal, but it helps keep the pain at bay)

There's a useful 4 week routine to strengthening your back in this months Triathlon Plus. It incorporates stretching, strengthening and condition and takes about 10 mins or less a day together with a couple of runs; may be worth having a look at that?

From experience back ache is often caused/contributed to by tight hip flexors, glutes and hamstrings and/or weak core muscles. Given you're doing 70.3s you can almost certainly rule out the weak core, and if you have being spending long hours training without long minutes stretching it's very likely that flexibility may be the source - the good news is that it's very easy to resolve. What's your flexibility like?