01 Machu Picchu is not that high
The confusion comes from packing the whole trip into a single word. Cusco sits at around 3,400 metres, and that is where altitude sickness shows up easily. Machu Picchu is at about 2,430, and Machupicchu Pueblo, the river town the bus leaves from, is around 2,040. In other words: the famous point of the itinerary is one of the lowest.
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02 How to order the trip
Order matters more than fitness. The version that works best for altitude-wary travelers is to descend before climbing: land in Cusco, drop down the same day to the Sacred Valley, sleep a couple of nights around 2,800 metres, and only then take the train toward the river. Cusco is left for the end of the trip, once the body has adjusted.
That plan has a pleasant side effect: it turns the river leg into the restful part of the trip. Machupicchu Pueblo is small, warm and humid, with the sound of water in the background. Sleeping there the night before lets you enter early without a three-hour pre-dawn drive.
03 What is still demanding
It is worth being honest: dropping in altitude does not make the site easy. The route inside the complex is short, but it is made of uneven granite steps, narrow passages and unprotected edges. And the optional mountain climbs, Huayna Picchu among them, are another category altogether: serious elevation gain, exposed steps and a separate ticket that sells out before the general one.

The useful question is not how much altitude you can take, but how many days you give the trip to reach it.
04 Verdict
Choose this trip if altitude worries you but you can give it time: four or five days, with the first nights down in the valley and the site in the middle of the route, not straight off the plane. Skip it if your margin is two days, or if you need ground without steps. Machu Picchu rewards those who sequence the climb well, not those who arrive fastest.
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