Have you considered the effects of altitude?
I got a gift certificate a few years back for a few gym sessions at some gym in Soho, London for myself and a partner (i took my wife).
They had an altitude chamber, you go in and they reduce the atmosphere to that of 8500feet and let you exercise, it was total eyeopener for her (and i admit it kicked my ass, pullups suck, pullups at 8500ft suck even more) she never saw the point of climbing and perpetualy asked "whats the big deal? walking up a bloody hill doesnt look that hard" after the session (which only lasts an hour) she had a newfound respect for the sport.
That and the sheer buzz you get when you come out, a notmal gym session gives you a bit of a buzz but this is like a gym on steroids or drugs or something, you feel BULLITPROOF after it.
So much so that i looked into building one (i found out you can get respirator gear that does essentialy the same thing albeit more cumbersome) the sheer costs involved where more than prohibitive though, but man the buzz is amazing.
Its also good for guaging if your at risk from oedema which is good to find out before your halfway up a hill and need to descend before the summit after putting in all the hard work
I cant for the life of me remember the name of the place, but i can remember it was excelent fun and a good day out.
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