
This guy looks like he is actually flying. These cool jumping stilts, or jumpy leg things, come in various sizes for people of varying weights. You could not have a ten year old, who weighs 86 pounds, jumping on Powerisers made for an adult who weighs 220 pounds, or vice versa.
Wouldn't be good, so they come in different sizes. These stilts are known by a few different names, such as jumpy leg thingys, air trekkers, and more.Even Kangaroo Shoes.
Here is an Amazon page where you can see more of those jumpy springy things.