As they won't be coming back in any case...
A bit of zero g spine lengthening will just be pre-mutation in preparation for living at low g on Mars :)
Meanwhile... as we work on the technology required to allow for return trips we can also work on exo-skeletons and cybernetics.
After all, if there's one thing science fiction teaches us it's that we will need an army of droids to keep the revolting Martian colonists in their place...
Biting the hand that feeds IT
