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Travel describes the (temporary) move to a different place away from the local home location. Every time someone moves to a new country many of the variables (climate, law, food, microbiome etc.) that affect health, happiness, cognition and productivity change. Based on some experiences this can be all of the variables. For example, Aaron Parecki slept better in different cities.
This means that those goal metrics should be monitored both for subtle problems as well as surprising improvements. Moving between countries could make a great QS experiment because its guaranteed to produce some interesting changes. Travel can be harmful and tracking could both detect and illustrate a disease. There is probably no group more likely to catch a new interesting disease than travelers.
Traveling also breaks up routine, so it may be wise to monitor such things as diet. Travel allows more unusual experiments like Blood Oxygen On Mt. Everest.