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What this research suggests is that 21 days to form a habit is probably right, as long as all you want to do is drink a glass of water after breakfast. Anything harder is likely to take longer to become a really strong habit, and, in the case of some activities, much longer.
How to Make Exercise a Habit. There's an urban legend that it takes 21 days for something to become a habit, but there's little evidence to back up this claim. For exercise, it's probably more like six weeks, says Rebecca Woll, manager of personal training at Equinox in New York City.