No, these acrobats aren't hovering all by themselves, they're actually being assisted by a very strong fan capable of generating 165 mile-per hour wind speeds.
These acrobats are trained to use their bodies to resist the incoming wind. By increasing their surface area, such as by sprawling themselves out, they'll catch more wind and the fan will overcome their gravitational pull to the Earth, making them appear to hover.
On the other hand, when they get out of that position, and decrease their surface area towards the fan, they will begin to ‘sink' downwards to the fan, where they will essentially repeat the process.
The reason that this works is because they're actually locked inside of a tube where all of the fan's wind can be channeled into one direction. If they weren't inside of the tube, the air would spread out in every which way and wouldn't be focused on the acrobats themselves.
One could say it takes a lot of practice to get this kind of stunt down, and it takes a lot of time to get used to making your body float in this incredible patterns with other fellow acrobats.
