Never Miss Twice: What 2,066 Habits Say About the Second Day

TL;DR. I measured the "never miss twice" rule against 2,066 real habits from 1,006 people. Once a habit has one missed day behind it, 80.9% of those gaps still end with a check. At two missed days it is 71.1%, a drop of about 10 percentage points, and that is the largest single-day drop anywhere in the curve. So the rule is aimed at something...