They also teach you how to do certain moves, like the Hurricanrana, the Power Bomb or the Vertical Suplex. Another thing that these schools teach you is how to break your fall. Wrestlers not only know how to execute moves, but also how to react when they become victims to such moves. Some accessories are rigged. For example, steel chairs used to smash someone's head in aren't made out of steel, but rather thin aluminum.
Tables can easily break, especially when a body hits it.
Even the mat has extra suspension, not only for safety, but also to exaggerate movements. For those who claim that wrestlers are not athletes, consider this. Wrestlers work non-stop, around the year. They travel from city to city each week to do a show. With Raw or Nitro happening the next day in a different city, one can imagine the effects of travelling continuously on the wrestlers.