We use push hands as a platform for training control. For this purpose we learn how to flow and use it to control our position.
In this respect, we can think of it as a game of your watermelon or mine where your opponent tries to take away your watermelon but you do not allow him to do so. You accomplish this by learning how to prevent your opponent from controlling your front gate by circling and flowing as per example shown below :-
Once you have the basic hang of it you can try implementing a principle made famous in Judo namely pull when pushed, push when pulled. Below is an example of how you can do it :-
Further along you can also test your ability to fajing quickly without going through elaborate set up and breathing patterns typically exemplified in fajing demos.
Our logic is simple – your opponent will not stand there and accept being fajing. He will fight back, he will turn, shift, resist and you have but a split second to fajing. Thus, you have to learn to do it on the fly or your fajing is not practical.
You should also test your defences by not fighting back but just holding your control. In the example below I allowed my student to see if he can get through. He tried to do so by moving faster but I adhered and rode along with his movement and was able to stop him from breaking through to grab my watermelon.
Another test we can do is to check the resiliency of our body structure. In the video below my student tried to move forward but was repelled.
There are a few reasons why this happened :-
a) His moving mass was not properly integrated
b) I have a structure that is resilient enough to absorb and bounce him without having to do anything other than to let him apply power and push himself off
c) He did not apply the principles of entering hence he ran into my defence
Finally, we should always keep in mind that how we move, where we put our limbs can be exploited by an astute opponent.
In the example above my student tried to enter but did not pay careful attention to where he placed his hand.
As a result, he got his hand caught in my arm and ended up locking himself. This is why keeping vigilance and awareness is important when doing push hands.