В этом году я… Как изменить привычки, сдержать обещания или сделать то, о чем вы давно мечтали

The book offers strategies for change, but I wonder what inspired the selection of specific habits and goals—was it based on research or personal experience?

I'm curious whether these methods have been tested outside of the book and how they hold up over time for different personality types.

It seems like so many struggle with consistency; I wonder what personal experiences or observations led to the emphasis on this particular challenge.