In my world ... Actually, in every hard sci-fi world with casual interplanetary travel, the G-force involved in acceleration would becomes so high that no unmodified human being could realistically survive it, leading to an authorial work around of some sort, or it simply not being addressed in the work (to my knowledge)

Now, in *My* fictional setting, the Administration of Mars has commissioned a series of torch ships to give Mars the means to unlock the solar system. These Torch ships have both the speed and acceleration to make a round trip from Mars to Earth in a week, and has a max speed of 0.001c . The problem is that stated above, it's transporting squishy squishy humans. But there's an upside! The people of Mars are obsessed with the concept of the artificially modifying humanity as the next step in human evolution, or "Human +". However, the Martian population is caught up in a sectarian dispute over the topic of post human evolution. One faction, the Anamists, believe that the path to human plus should be layed in biotechnology; Whereas the other faction, the Machinists, believe that humanity should move increasingly away from biotic life.

Now, due to the Torch ships being already made, ***inertial dampeners cannot be installed***, so, the Martian administration let loose the two factions to create body modifications to survive the immense G's of the torch ships. The modifications must -

* allow an untrained human to stay conscious at over 100 G's
* allow a trained human to stay conscious at over 300 G's
* allow humans to survive at over 1000 G's for extended periods of time

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***My Question is -***

What Technological / Biological body modifications would allow humans to function and survive at the given parameters?