Hacky Sack is a popular activity that utilizes agility and coordination. In 1972, two men in Oregon, John Stalberger and Mike Marshall, created a type of footbag activity and called the game "hack the sack." Stalberger later sold the trademark to Wham-O, after Marshall had died in 1975 at the age of 28.
Kicking the bag with the foot is the basis of Hacky Sack. For many beginners, this can be a frustrating learning experience. The key, whether using the inside of the foot, the outside of the foot, or the toe, is for the foot to be level at the time of contact with the Hacky Sack, enabling control. Practice keeping the Hacky Sack in the air with just the inside of the foot, then with the outside, then practice alternating the two.
In addition, many people who pursue the sport at advanced levels buy flat-surfaced sneakers, which are perfect for kicking the bag.
Kicking with the knee is the next trick to learn. The knee should be bent at a 90 degree angle, and the lower part of the leg should be in a straight line with the foot. When kicking the Hacky Sack with the knee, use a straight-up motion to keep the bag in the air. Practice with both knees, then practice alternating between each knee.
The next step in mastering Hacky Sack is to practice delays, or stalls. Instead of kicking the Hacky Sack into the air with the foot, bring the foot up and stall, or catch. the bag on the inside of the foot. Practice this move with the outside of the foot and the toe as well, then practice it with the knee. Being able to stall the bag out before setting it in motion again is the first step in learning more advanced tricks.