Well it's awful. You stand out of the saddle and bring your body forward so you are for example standing over the down tube, and the saddle is not in the way anymore. Then you do a short squat. Some even go into a run and squat for example every 10 seconds.

Okay, I ask you, can someone tell me WHY you use a spinner for squatting? Wouldn't it make sense to stand on the floor?!