Hyperbolic Time Chamber

Hyperbolic Time Chamber is a place located in Kami's Lookout. One year inside the chamber is the equivalent to one day on the outside. A step over the threshold of the training area brings one immediately into ten times Earth's gravity (the same as that of Planet Vegeta, Planet Zoon, and King Kai's planet); the air gets denser, and the temperature fluctuates, the deeper one goes into the training area.