I’m from sea level, and a trip a couple of years ago to Colorado Springs (6000-7000 ft.) really kicked my a** physically for the first 24 hours. Surprised the heck out of me.
However Obama has been in Colorado a lot, lately. And he prepped at Las Vegas, which is about 2000 ft.
So I don’t think Gore’s claim holds any validity.
Same for me when I went from Long Island to Whistler Mountain in BC. Felt like a 24 hour flu.