With their opposable toes and flat feet, early human ancestors have often been portrayed as weird walkers, swaying from side to side or rolling off the outside edges of their feet. (sciencemag.org)
They may have walked a bit more like chimps, perhaps pushing off the outside edge of their foot more, says Tea Jashashvili of the University of Southern California in Los Angeles and the Georgian National Museum. (sciencemag.org)
To do it, bring both knees to the chest and grab the outside edges of your feet / ankles, then place your elbows inside of your knees and lift your feet up and gently rock side to side as you breathe slowly through your nose. (fitnessandpower.com)