Hero's Training Chamber

Hero's Training Chamber is Hero's own unique training area, it is located under his house. Even though it's physical size is the same as his house; the actual size of the Chamber itself is unknown.

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 air gets denser, and the temperature fluctuates, the deeper one goes into the training area.

Description
The Chamber has an entrance at its center, located in a central building with two side wings with housing, food supplies, bathing quarters and sleeping quarters. There is no night or day in the Room, but the surroundings remain a constant bright iridescent white aurora. Its reflective floor is of undefined area, and the Room's boundaries are thought to stretch to infinity in all directions even though it appears to have a definite atmosphere, limiting its size.

The time dilation that occurs in the Chamber is one day of real time is equivalent to one year in the Chamber, or 1 minute of real time is approximately six hours in the Chamber. There are dual giant hourglasses of emerald sand adorning the sides of the building that count down a year within the chamber. A clock on the dome roof of the main part of the building tells the applicable time in the real world.

This essentially allows for someone entering the Chamber to get one year worth of intense training in a single day.

Trivia

 * The idea was inspired by the Hyperbolic Time Chamber (Also known as "The Room of Spirit and Time") from the Dragonball franchise.