I have heard people say that based on our current understanding and ideas for possible/current technology no person would ever be able to even travel at a solid (70-80%) the speed of light because getting up to that speed fast would kill the person inside (pizza) because first, the spaceship will accelerate into the person, then the atoms on that persons' back will be accelerated towards the ones in front and so on... In the end, the person is flat and dead.
So I was wondering if we were able to give each and every atom within the system that is the spaceship the same forward motion as is being applied by the rocket's thrust (that includes all atoms making up the oxygen molecules ect.), would that then solve this problem of very fast acceleration necessary for light speed?