It’s so freakin’ simple…almost as primal as barefoot running, but a bit less stressful on the body but still very effective in giving one a good cardio workout.
[youtube=http://www.youtube.com/watch?v=AMLAYFB_oHU&hl=en&fs=1&color1=0x234900&color2=0x4e9e00&border=1]