Discipline
Discipline - the single most important factor for progression.
Discomfort is an inevitable circumstance of improvement.
The further along we progress, the more challenging it becomes to move further forward.
This isn't due to lack of improvement, but the establishment of greater heights to overcome.
In order to go where we've never gone, we have to do what we've never done.
This requires diligence, and consistency in our actions. AKA discipline.
Faltering prolongs the process. The more often we falter, the harder it will be to stay the course.
The less we do, the less we want to do.
If it's only going to get harder, why be easy on ourselves?
Stay the course. Follow the plan. Be disciplined, and accomplish more.