Thanks for the input. It really supports my thoughts on the attempt.
I will not participate in a race but build the route myself in the local area. Since I have been running/biking here for 20+ years I know all the hills and will of course try to avoid all of them. Hence I can also plan it to be in perfect running weather.
Also I am used to fuel 250-300 calories (gels only) during both running and biking so that is no issue either.
I have not tried 2x20+k during a weekend but I will certainly try it out before I do a 50k attempt. If it is done at race pace I certainly don’t think it will be any issue.
Training volume might be a problem. I can do 20-30k of running a week without back pain. The rest needs to be substituted by rowing and biking.
How about clothing? I did consider compression socks and a compression t-shirt to avoid too much skin movement during the run.
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