Do you think humans are meant to move? Well, Kelly McGonigal, Author and Psychologist, has proof, and they're called 'hope molecules'. In this episode, Kelly breaks down the science behind hope molecules and why, even when you're a hot sweaty mess during your group runs, you still love it!

You can find Kelly on Instagram @kellymariemcgonigal or head to her website, kellymcgonigal.com

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