Or the best way to crack kid skulls in the 80s… also known as Springbal, Lolobal, and Disc-O. It was a hit in the middle of the 80s when it started to be mass-produced by Hasbro.
It’s a Saturn shaped toy and to play with it, you have to stand (at least try to) on the plastic form and keep the rubber ball between your legs and jump… then fall 
Pogo ball commercial from 1985 :
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