ChrispenEvan said:

A bit like Formula One drivers – They have special machines that they work on to strengthen their neck muscles so they can hold there head up for the whole race. At high speed the cars can generate up to nearly 5 G’s lateral and that’s very tiring unless you’re prepared for it.

My little racing car can generate a little over 2 G’s and I need to work on my neck muscles, even for short (5 – 10 minute) races.