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Notice a recurring theme in this chapter?
You can create your own routine at the airport, which is always a good idea since we know that endless sitting is very bad in the long run. Plus, all that lousy food, stress, jet lag, and lethargy feels crummy in general, right? First, just constantly walk, ideally outside, and try to take your carry-on stuff in a backpack. This makes it easier to convert your airport waits into weighted hikes, which are a good form of exercise.
Always take the stairs instead of the escalators, always, and walk instead of lounging on the conveyor belts or moving sidewalks.
Constantly drink water and refrain from stuffing your gullet with all that crappy airport food, like mass-produced pizza, old cellophane-wrapped sandwiches, vending-machine junk, and er, um, wine and margaritas. Just bring some nuts or grab a piece of fruit once in a while. Fasting is perfect for airports.