OK ...
I don't care how slowly you start off ... getting beyond 700 MPH would put stresses on an average body it could not process .... and then y'gutt'a slow down and come to a stop
Does anyone REALLY think you're gonn'a step out in front of the Eiffel Tower in 1/2 hour and get to that sales meeting bright and chipper with your presentation ?
Jet lag does not begin to desribe it.
Why would speed have any effect on the human body? It’s acceleration, deceleration, and changes in direction which create gravitational stress. There are three people right now traveling at 17,300 mph.
People survived acceleration and deceleration in the Concorde and other planes all the time. Provided the deceleration is not 760 mph to 0 mph takes 5 min rather than 3 or 4 seconds people will survive.