I live at 2900 feet. Last week on vacation I was hiking around Yosemite (4000 - 6500 ft) with no problems. Some of my low elevation California family (my brother lives at about 15ft above sea level) were complaining about feeling short of breath. He's a pretty fit guy.

For those of you who live at higher elevations, do you find that you get less gassed than flatlanders in general? Are you cardio monsters at low elevations?