Pressing? I press with my hands I thought. Yes and no. To issue energy there must be a root, or for my physic nerds, an equal and opposite energy! Due Ba Li (opposite power), can be expressed in many different ways (the theory can be quite deep and expressed from whole body to 1 inch 😉 but no greater way then by rooting through your feet and exploding its opposite energy the other direction.
Now some people will imagine their feet deep in the earth while others will use their intention and develop a strong Yongquan (K-1) connection in the middle of the soles of their feet. The idea is the press through the foot, if you do not connect your foot to the earth is some fashion the energy will be false and weak. Even weightlifters understand this as they squat or deadlift, its not just the muscles contracting and extending but the pushing down that generates quite a bit of power in the lift as well. Hell Sir Isaac Newton must have been practicing Tai Chi because his third law of motion is based off this principle (well maybe… 😉
The truth of how this truly works still lies within the connection the body, the relaxation, and the smooth breathing. As the foot connects the body stores the energy and releases it at the appropriate time through the proper channels internally, between joints and nodes, meridians and tendons! Without proper form the pressing will be useless. The tenacity of the movement has to find its power delivered from the foot!