Alberto wrote:...remember our training session when we practice pushing partner along the gym - back leg push and then half step and push again...?
You are describing a common problem for beginners. Indeed, the most simple, physical type of
fajin is much like the springy way we use our bodies when jumping. The only difference is that instead of using this power to jump up, we send this jolt thru the body. So we have to learn how to let our body be a good conduit for this power. This is a new skill to master, so everyone should take their time learning.
The most important thing for beginners to understand when they begin working on how to
fajin is: proper technique is far more important than how much power you have or how far you push anyone. If the technique is correct & thus the understanding is good, then power will come naturally & easily. If one simply shoves with the arms, over & over, one will make no progress & just feel tired after practice.
Also you can instruct the partner being pushed to not resist at all & be a little stiff, in other words, not to do good
taijiquan. In this way its very easy to push them. When its easy to push, the student practicing will concentrate more on proper technique & less on trying to look good by pushing their partner a long way. Instruct them that its not a contest, they should help each other bring the energy out.
Have your new students use as little power as possible & just push their parnter a meter or less. You all have that big gym to train in, lots of space. It may make beginners feel like they have to use big pushes when its their turn. Plus they see older students, like you, giving the juniors "flying lessons".
Best of Luck, Looking forward to seeing you all again in June...
regards