What would it take for humans to live comfortably in 3g?

I'm looking for answers that focus on changes in internal anatomy that allow humans to survive in a high-g environment. If dramatic visible change can be avoided, that'd be great.

Problems
Circulatory: Blood is much harder to pull away from the ground. Energy needs to be delivered to muscles at a higher rate
Muscular: Muscles are under more stress due to lifting heavier loads
Skeletal: The skeleton need to support a load with 3x the weight

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What would it take for humans to live comfortably in 3g?

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