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This is quite interesting, recently I watched video explaining similar rail-gun/cannon concept, end explanation what would it take to work for human payload.

https://www.youtube.com/watch?v=Rb6sxy3f7VE

Well train human can survive:

38G for 0.5s

9G for 2min

7.5G for 5min

https://www.youtube.com/watch?v=-4lVfrTcr0c

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What kind of training is there to survive 38G for 0.5s? Maybe the body can become habituated to accelerations over time or something, but what would you be training to actually do before or during those 0.5s?

Physical training I guess, trying different G's for long time, exercising breathing under elevated G's ... I do not know, I just wrote what author said in video.

This guy worked his way up to 46.2G, the "highest known acceleration voluntarily encountered by a human": https://en.wikipedia.org/wiki/John_Stapp

Not without problems though. He "sustained a fracture of his right wrist during the runs on two separate occasions, also broke ribs, lost fillings from his teeth and bleeding into his retinas that caused temporary vision loss".

This is during short periods (of deceleration), so very different from SpinLaunch's launches.

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