The Research in Cleveland cent NASA engineering team has created a special space simulators, motion simulators in weightlessness (Standalone Zero Gravity Locomotion Simulator), which allows for future astronauts to create conditions similar to those with which they will encounter in space.
To simulate a state of weightlessness on the space treadmill, man placed horizontally to unlearn a conventional terrestrial direction of gravity. With the new simulator future astronauts as it re-learn to walk and run, but not in the horizontal direction and in the vertical.
The incoming load is precisely controlled, making it possible to simulate the conditions of weightlessness on Earth orbit or conditions on the moon, where the attraction is 6 times less than the force of Earth's gravity.
Also, the device can be used to simulate the physiological effects of spacewalks.