Hyperbolic Time Chamber

The Hyperbolic Time Chamber (精神 と時の部屋, Seishin to Toki no Heya; lit. "The Room of Spirit and Time") is a place located on Kami's Lookout.

Inside the chamber, time seems to pass very slowly, with one year in the chamber being one day on the outside. There is a higher gravity level than Earth's. A step over the threshold of the training area brings one immediately into 10x 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.