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I honestly don't understand the fascination with Mars colonization. 50 years ago it made sense, maybe even 20 years ago, although that's pushing it. But everything I've found indicates the gravity is too low and will cause major long-term consequences. That's one thing for the ISS or for spaceships which can generate artificial gravity via centripetal force, where you have a regimen of eating/exercise to combat it for astronauts, continuing research, etc. It's quite another for a scenario in which you are considering a 'second home' for humanity. For any sizable colonization it's got to be user-friendly, and the gravity issue makes that a non-starter from everything I've been able to discern.
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