Aerotrim is the original name for what is also known as a ‘human gyroscope’: three rings inside of each other that enable a human rider to turn and twist in any direction by shifting one’s body weight. While there have been several variations (including rectangular ones) under various names, the Aerotrim was the first commercial version and the most popular one.
Developed throughout the 80s by the Contactos Trading company (its former CEO Hermann Dittrich is credited with coining the term), it was primarily used as a cardio-training machine in gyms. Due to its ability to mimic the feeling of weightlessness it was also used as a training machine for pilots and astronauts. Albeit the original version is operated through the weight of the rider, there are motorized version. Due to its scifi appearance, it was often used as a scifi prop, most prominently in the gym of the spaceship Enterprise.
While still being produced under various names and designs, the original Aerotrim is no longer in production. It can still be found in a few gyms and a few pilot training center, but it is now most commonly found as an attraction or ride on fairs and for event rentals.