|At first, it's new and most new and different things can be hard.|
Once you get the hang of it and get through one cycle it becomes quite easy.
As your actions turn to habits it becomes almost impossible to fail. Part of the reason it succeeds is because the program isn't that difficult.
It also requires changes to your diet and exercise regimen.
I'm never hungry. I don't crave many foods. I can eat what I want when I hit a reward day. The exercise is built into my day.
I get plenty of feedback from the charts. Why people can't lose weight is beyond me. This method works like a GPS. Follow it and you'll arrive.
Also it's flexible and adaptable to the individual.