I found that we were not affected by it at all, apart from occasionally out of nowhere just needing to take a really deep breath every now and then. This would

I found that we were not affected by it at all, apart from occasionally out of nowhere just needing to take a really deep breath every now and then. This would be at really odd moments where I was not really exerting myself - e.g. sitting at the dinner table. We still drunk the cocotea etc though for the "authentic" experience! For what it was worth, we were not especially fit and a bit overweight at the time. We spent a few days in Cuzco taking it easy to acclimatise. We were more worried about getting sick from taking showers or drinking local water than the altitude. There is some cool blockwork to see in Cuzco too (although it is quite a steep walk up to the citadel)