I disagree - I think it's a matter of perspective. Many people see the task of getting in shape as some herculean effort requiring inhuman willpower, subconsciously setting themselves up for failure.
It's much easier to do something you have to do. Much harder to do something that isn't required of you.
Consider this - most people spend 40+ hours at work, 5+ hours in commute, only to go home and spend most of the rest of the waking hours doing house chores or attending to family needs - this is a truly epic investment of human effort, yet almost every adult does it without thinking and nobody thinks it's exceptional, thing is, it's kind of expected of people. Compared to that, the amount of sacrifice needed to get healthy is miniscule - only the lack of boring routine and social expectations make it seem otherwise.