How does human floating magic work?

There is a heavy iron plate on the ground and a steel pipe in the crutch. The steel pipe goes into the performer's sleeve, then goes down his body and connects with another steel plate, and then he sits on this steel plate. Welded steel members can withstand the vertical load and bending moment caused by human weight. Sometimes performers will let you perform with crutches to show that there is no mechanism in your face. It is estimated that these branches have been improved in design, with some special connection ports that can be separated and assembled at any time, or with folding mechanisms, similar to telescopic rods for the blind.