Imagine you’ve set the goal of running a marathon that’s 90 days away. You’ve hired a trainer who says this a less than optimal amount of time, but if you stick religiously to her fitness routine, nutrition plan, and sleep schedule, you’ll be ready come race day. Cheat in any of those three areas, she warns, and you won’t be able to run 26.2 miles on three month’s notice.

Let’s assume you feel pretty good about your odds of following through in each area. You believe there’s a 70% chance you’ll stick with the fitness routine, a 70% chance you’ll stick with the nutrition plan, and a 70% chance you’ll stick with the sleep schedule. What are your odds of doing all three and showing up ready to run?

The answer, surprisingly, is only 34.3%. You have three prerequisites to success. Individuall

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