I am now at about 1000m, and I feel like I can breathe through my skin.
Did a 200m climb on a hike today without a pack and it felt like taking an elevator.
Weirdly, I couldn't get my HR past about 140 no matter how hard I tried. Reverse altitude acclimatization is a thing, I guess?
@grajohnt I once walked something like ten miles across London when I went back without even thinking about it. Enjoy the temporary superpower!