Some get it.
Some never get it.
But if you have faith and dare to try then you will get it, that is how to use minimal strength in Tai Chi to fajing.
Students keep thinking that to fajing they must develop thigh muscles to fajing but this is a misunderstanding of how physics work. It is also a lack of understanding of strategy especially the part where your opponent will try to hit you back.
I divide fajing into 3 types :-
a) Using localized muscles
b) Using entire body muscles
c) Using muscles still but with minimal exertion
The phrase “use no strength” in Tai Chi principles refer to (c) because your body will collapse if you use no muscles.
The (a) approach is inefficient and will tire you out fairly quickly especially if you are doing vigorous push hands. This is why students find the idea of doing push hands non-stop continuously for an hour because they know that its tiring and they cannot last for more than a few minutes.
Yet, when I was learning from one of my Tai Chi teachers we used to do push hands like that. If you don’t learn not to conserve strength and use your entire body you will tire out fast and end up with sore muscles.
Approach (b) is better but there are implications that will affect your balance and speed. You only have to think carefully about Newton’s three laws of motion to know what they are.
One immediate implication is that if you miss and lose your balance your opponent will have an easy time counter-attacking you.
Approach (c) sounds wimpish and ridiculed by those who misunderstand it. I call it the high heel approach because a woman’s high heel shoes embody efficient use of the physics of power. If you don’t know what it is ask a lady to wear a high heel and “gently” stomp on your foot.
When you use strength intelligently you can play longer because you are not wasting strength. Its common knowledge that a bigger guy will typically beat a smaller guy. This is why we learn martial arts, to learn a way to use what we have, max our strengths versus the weaknesses of our opponent. If we don’t we lose. Its that simple.
Lucky for us, not everyone is good at everything so we have some play. Push hands is where we learn what the plays are. So for example, you can learn how to make your training partner do something without realizing that he is doing it. You also learn how to get a position from which you can easily make him lose his balance with the use of little strength.
All this takes careful learning after you believe its possible to do so. Rome was not built in a day and neither push hands learned in a lesson. You first have to understand the problem and what the solutions are especially the why of a solution. Then you have to learn how to implement the solution, paying attention to all the nuances required to make it work like magic. If not, the technique will fail. The solo form is where we learn the controls necessary to move ourselves in certain manners.
Once you have everything in place you should get it. If not, then maybe Tai Chi is not the art for you and its better to move on to something else.