1. 1% more/ 1 more principle

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In many of our endeavors, we limit ourselves mentally and physically with some arbitrary point of can't. The 1 more principle challenges you to do just a small, nominal amount of work/effort beyond that line. It repeatedly reinforces in our brain that we are more capabale than we give ourselves credit for. It also uses the process of progressive overload used by weight lifters and other athletes to  build strength and endurance.