try this at home:
stand with your right shoulder and right foot against a wall (body perpendicular to the wall) sink your chi, and see if you can lift
your left foot (the one not against the wall) and hold it up for 5 seconds.
sounds easy; try it.
this doesn’t work because of gravity, your shoulder comes out further than your foot, so if you do that your foot is under your should and not under you body so you have nothing supporting your body, so you fall over
Supposedly Sun Lu Tang could do it, but who ever saw him? Can you do it Mac’? Having a strong root is important, but how is that exercise gonna help you fight? I guess being able to do the impossible could be useful… Where’s my cape, Boy Wonder?
“Do not fight with another’s bow and arrow. Do not ride another’s war horse. Do not discuss another’s faults. Do not interfere with another’s work.” -Ekai Mumon Roshi