Everyone starts motivated. That is not the hard part. The hard part is week six, when it is raining and you worked eleven hours and nobody would know.
Motivation is a feeling
It shows up when you are rested and disappears when you are not. Building a plan on it means the plan only runs on your good days, and your good days are not the problem.
Structure is a decision you already made
The session is on Tuesday because you decided that in advance. There is no negotiation on Tuesday. That is the entire trick and it is why it works.
Discipline creates freedom.
Make it small enough to survive a bad day
Every session in the program has a twenty five minute version. Not because that is the goal, but because the twenty five minute version done tired beats the full session skipped.
Stack wins. Small ones count.