The idea is to try something new or to add a habit to one's life for 30 days, as this is long enough to establish a new habit or to break a bad one.
The author found that doing these challenges was memorable and helped to build self-confidence.
They also learned that small, sustainable changes are more likely to stick than big, crazy challenges.
Additionally, the author wrote a novel in 30 days as part of one of these challenges, which gave them a sense of accomplishment.
Readers are encouraged to think about something they have always wanted to try and to give it a shot for the next 30 days, as even if they weren't to do it- the time will pass anyway.