See the world record holder in hand held slingshot in action and learn how a slingshot actually works. Tobias can actually generate over 100 jules of energy with his slingshot. That is some amazing power as you can see it can punch through some very thick boards. Destin from Smarter Every Day shows us that you get the most energy from a slingshot if you pull back and fire right away, if you pause with the rubber bands stretched they cool and loose power.Â