This routine demonstrates the power of partner work by leveraging your friend’s body weight and your own to help increase flexibility and build strength. This partner workout was designed by Pete Egoscue, author of the Pain Free series of books. (Learn more about Pete Egoscue here.) You and your friend or significant other can use one another as a barometer for balance and maximize muscle engagement with this fun routine. If one you loses your core stability, there’s no hope for the other—so lean on each other! You’ll work on shoulder and back flexibility, abdominal and leg strengthening, and you’ll conclude the routine in Downward Facing Dog.