What does it mean that building in flexibility?

Routines with some built-in flexibility survive disruptions better than rigid ones.

Example: You and a colleague both meditate daily. She meditates at exactly 6:00 AM, in her living room, on her specific cushion, for exactly twenty minutes, using a single guided app. You meditate sometime between waking and lunch, in whatever quiet space is available, seated or walking, for anywhere from five to twenty-five minutes, with or without an app. For six months, your outcomes are identical — you both meditate every day. Then a work trip hits. She misses four days, struggles to restart, and loses the streak. You meditate in the hotel lobby before breakfast, eight minutes, eyes open, no cushion. The habit never breaks. Same discipline, same commitment, same streak — different architecture. Her system was optimized for ideal conditions. Yours was optimized for real ones.

Try this: Choose your most important daily habit. Write down every parameter it currently depends on: the specific time, the specific location, the specific tools, the specific sequence, the specific duration, and any other conditions that must be true for the behavior to fire. Now, for each parameter, design two alternatives that would still allow the behavior to execute its essential function. If you journal at 6 AM at your desk with a specific notebook, your alternatives might be journaling at lunch in a break room on your phone, or journaling before bed on a laptop. You should end up with a matrix: one habit, six or more parameters, two alternatives per parameter. Test one alternative this week — deliberately execute the habit using a non-default parameter — and note whether the essential function was preserved.