you do not need any special training or equipment to survive any particular speed (or velocity), like the speed of sound, as long as you get to that speed comfortably.

you DO need special training and/or equipment to survive extreme G-forces (acceleration). Acceleration says nothing about what your speed/velocity is, only how quickly it’s changing.

For example, think about astronauts taking off in a rocket. At launch they experience extreme g-forces as the rocket makes them accelerate upwards. But once they reach the orbital or escape velocity they need for their mission the rocket turns off. They stop accelerating and feel no g-forces at all (micro gravity), but they are still cruising along at an extremely high velocity.

The question was about surviving it, not getting past it unscathed.

And its usually loaded in line with your spine, rather than sideways.