Why are stances important in kung fu?
Stance training is the most essential in any kung fu regimen. Proper balance from stance is required to execute techniques in kung fu.
In the case of executing sow chui, a large looping roundhouse hook punch, requires a strong balance of stances. Sow chui is a technique which gathers a lot of energy during the swinging execution. In addition, the power gathered from the whipping of the hip/waist gives the techniques a devastating blow to the target upon impact, similar to swinging a sledgehammer to break concrete blocks, mortar, etc. If the balance of the person executing sow chui is not strong or rooted to the ground, the person will fall during execution.