Habit stacking is a way of creation an implementation intention by adding a habit directly after an existing habit. For example, if you are trying to do 10 push ups a day, you might add this habit by saying “After I brush my teeth in the morning, I will do 10 push ups”. This method way developed by BJ Fogg in Tiny Habits1.
1. Clear, J. Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones. (Avery, New York, 2018).