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“exercise-induced brain chemicals help people think clearly.”
― The Happiness Project
― The Happiness Project
“Enthusiasm is more important to mastery than innate ability, it turns out, because the single most important element in developing an expertise is your willingness to practice.”
― The Happiness Project
― The Happiness Project
“A recent study showed that 25 percent of Americans don’t get any exercise at all. Just by exercising twenty minutes a day three days a week for six weeks, persistently tired people boosted their energy.”
― The Happiness Project
― The Happiness Project
![By Gretchen Craft Rubin The Happiness Project [Paperback]](https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1697790707l/164746963._SX98_.jpg "By Gretchen Craft Rubin The Happiness Project [Paperback]")
