And fail.
Willpower only works in the measure it is fueled by passion, revenge, or similar emotions *which are never innate* but always the result of some experience.
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Willpower is not something that can be summoned at will.
Whether that start will produce some experience that will get you "hooked on" is what determines whether you will power through.
Or whether you get yourself to experience a pressing incentive.
Not willpower.
However, unless they get themselves to desire the action that will take them there, they will only be left with frustration.
That desire is created through emotional experiences.
Do not imitate their actions; not yet.
First, do what it takes to get their drive.
Experience what you got to experience
to get their passion.
The rest will follow.
If you desire an outcome, begin by getting yourself passionate with the actions that take you there.
Begin by experiencing their benefits.
It won't be sufficient, but it is likely to be necessary.