His immense ability to achieve his goals came from his parents. From the age of 5, his dad taught him the importance of practice and repetition by making him do sit-ups to earn his breakfast. With this strategy instilled, as Arnie grew older, he applied it to all aspects of his life.
When Arnie’s goal was to become Mr Olympia, to get bigger muscles than everyone else he did more repetitions than everyone else. At one point he would exercise for 6 hours a day and complete 500 sit-ups or 1000 calf raises. By anyones standards it was extreme but by the age of 25 he was the number 1 bodybuilder of all time.
When (in the 1970s) his goal was to become a millionaire, to get more money than most people he did more repetitions/practice than most people. He would spend 8 hours a day looking at houses and apartments in Santa Monica, talking to estate agents and talking to real estate investors, learning as much as he could so he could achieve what he wanted.
With the financial freedom he achieved from buying and selling houses, he was able to pursue his next goal. He wanted to be a Hollywood star. People told him that his foreign accent would get in the way so what did he do? He practiced with a speech coach for 7 hours a day until he toned down his accent to a point that people would accept him for acting roles.
There are lots of other examples of how Arnie applied this strategy and mindset in the book but you get the point. There’s a proportionate relationship between the repetitions/practice you put into your goals and the ultimate outcomes you achieve.
If you’re going to take the time to practice, practice like the elite.