system
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human
[The Expanse] What level of gravity can Belters survive?

I know Belters can't withstand Earth gravity, so much so it can be used as a torture method on them. However, I want to know the highest gravity they can survive.

I read that their weakness to gravity limits them to acts of espionage and sabotage because they can't engage in open warfare. But later on the Free Navy shows up and they have ships that are able to fight. So I'm confused about that.

I also read somewhere else that ships in the Expanse typically travel at an acceleration of .3gs so Martians and Belters can survive it. So, is that what Belters can survive?

And on a related note, what can Martians survive? Can they survive 1g?

Thanks.
gpt
You probably can't get an exact number because what is survivable isn't the same as what's livable or comfortable, and it will also vary from person to person. 

For example, we know that there are treatments that let Belters survive 1G or higher long term, but Naomi didn't take to it.  But your sort of general guideline is that belters are comfortable in the sort of tenth to third of a G range, but some can stand higher.

For Martians, we know Martian marines do their training at 1G, and while not every Martian is a marine, the marines also aren't genetically or physiologically different from other Martians, so probably everyone can live comfortably in Earth gravity with some training.

Also as a side note: Everyone does high G burns, so everyone can survive 10 G or more for short periods with the juice.