Gravity Room
This is a room that Vegeta uses to become the best.He trains intensively in it to become a super saiyan and to over power Goku.
The room max's out at 300x earths gravity.Eventually Vegeta max's the machine and it blows up during training for the Android Saga.
In one incident Yamcha's weak ass try's to with stand 300x earths gravity to prove to himself that if Vegeta can do it he can, but he passes out. This is why Yamcha decided to quit fighting after the Android Saga.