Twenty Minutes Outside
Twenty minutes outdoors every day, no destination required.
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Why this one
Short and unglamorous enough to actually do, which is the only quality that matters in a challenge.
The rule
Twenty minutes outdoors every day, no destination required. For 14 days. That is the whole thing; there is nothing to sign up for and nobody is tracking you.
Post the card on day one so somebody knows you started. That
is the only accountability mechanism that reliably works and it is free.