I usually think of habits in terms of willpower. It’s just one perspective, which is focused on the development of positive habits and routines.

Willpower is like muscle. You can only use so much before you get tired and it stops working, and if you regularly use it eventually it will get stronger. So, the strength of a habit depends on how much willpower it takes to complete. If you go for a run every morning without even thinking about it, that’s a strong habit. If you do it regularly but have to drag yourself out of bed, it’s a weak habit.

Worth noting that a key to building habits is to work on one at a time until it takes very little willpower.