Tourist in MSN Thanks for your contribution. (1) I ride my bike on the trainer, which is equipped with a Stages PM. So while I do not put that much faith on the actual numbers, it is still a useful indication of the evolution of my power output, over time (weeks, months, years). (2) completely agree with your point that training for (or getting used to) long days in the saddle is important. I'll certainly ride a few centuries before the start of my trip. My objective is to be in a good enough shape such that I can sustain 150kms/day, days on end, whereas now I was more likely to average 100-130; or perhaps more accurately, as I am 68, I want to determine if my stamina remains quite constant. For now, it looks like it -- knock on wood.