Because exercise isn't essential for short-term survival, we don't exercise enough, so we need to reincorporate purposeful physical activity into our lives. Script Writer, Editor and Video Narrator: Alex Reich Video Illustrator: Arcadi Garcia Video Director: David Goldenberg With Contributions From: Henry Reich, Kate Yoshida, Ever Salazar, Peter Reich, Julián Gómez, Sarah Berman Music by: Nathaniel Schroeder