In every great undertaking there is inspiration and utter despondency. Both can immobilize. Inspired, overconfidence and inaction are prone. Despondency is almost certain immobilization.
Success is doing despondent, soberly acting when inspired.
Getting your healthy lifestyle together depends on what you do in those moments that you feel powerless or falsely secure.
At the end of the day and at the end of your life, happiness and peace will depend on whether you acted. What resulted from your actions will be secondary.