Humans aren't built to sit ...

Humans aren't built to sit all day. Nor are we built for the kinds of repetitive, small movements that so much of today's specialized work demands. Our bodies crave big, varied movements that originate at the core of our body.
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 Scott Jurek

Quotes from the same author

Every single one of us possesses the strength to attempt something he isn't sure he can accomplish. It can be running a mile, or a 10K race, or 100 miles. It can be changing a career, losing 5 pounds, or telling someone you love her (or him).
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 Scott Jurek
You could carry your burdens lightly or with great effort. You could worry about tomorrow or not. You could imagine horrible fates or garland-filled tomorrows. None of it mattered as long as you moved, as long as you did something. Asking why was fine, but it wasn't action. Nothing brought the rewards of moving, of running. Sometimes you just do things.
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 Scott Jurek
We strive toward a goal, and whether we achieve it or not is important, but it's not what's most important. What matters is how we move toward that goal.
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 Scott Jurek
We move forward, but we must stay in the present.
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 Scott Jurek