what is a hacky sack
A Hacky sack is a small bag filled with small pebbles or beads that is used to play a game with your feet. The object is to keep the Hacky sack in the air and off the ground for as many hits as possible and try to have everyone in the hack circle to hit it at least once. Once you are good enough you may attempt tricks such as behind the leg, around the world, stalls, ankle breaker, up and over, etc.