Million Dollar Habits

I'm curious whether these habits are based on his personal experience, research, or success stories from others. How did he narrow down to these particular practices?

Some habits feel simple on paper, but sticking with them requires real discipline. I wonder how others stay consistent with these power practices over time.

There are so many books on habits and wealth. Does Tracy's focus on daily routines stand out, or do you see overlaps with other strategies you've encountered?