While it seems like it should be relatively simple to change our behaviour—instead of doing A, just do B—in reality we've all developed certain longstanding behavioural habits over the course of our lives, and habits are hard to break.
In order to break our habitual ways of behaving, we need to:
STOPP is a mindfulness practice we can use to help stop ourselves from acting on automatic pilot and out of habit, and instead to choose our actions more mindfully.