By Yang Shuangxing
Back in the early days, taijiquan enthusiasts practiced striking crude heavy bags as well as wooden posts (which were really just posts that had been stuck in the ground). The idea was to strengthen and toughen the bodily striking surfaces, and to increase the density of the bones. No callousing...just strengthening and toughening.
The same thing holds true for practitioners of xingyiquan and baguazhang. Bagua stylists would plant several poles in the ground and then practice routines that involved manneuvering around them while “sliding” their arms against them (many current devotee still do this). They would also strike the posts in a variety of ways.
Most Chinese striking posts are bare wood. I think this is a problem. Striking bare wood is, if the blow has any “guts” to it, rather painful. Your subconscious mind will not permit you to strike with much power. It's protecting you from doing something that it regards as harmful (and probably very foolish). Don't believe me? Walk up to a solid post of some kind and give it a good whack...not a homerun punch, but a strong one. Just 50 reps. Odds are you'll barely be tapping it when you get to 50...if you even make it that far. Even if you place a pad on the immovable post, it won't help much.
When you strike a solid post or anything else that doesn't “give”, YOU will absorb almost all of the power of your own blow! That's because your target is more stable than you are. I have seen photos of well-known gong-fu and karate teachers punching a pad that has been affixed to a tree. Such practice is harmful and foolish. Period. The same thing goes for beating the hands against large rocks and concrete or steel pillars.
In my opinion, for what it's worth, there is no better striking post than the old Okinawan version. It is padded and “gives” a bit when struck. And that's a critical issue. The object in using this device is NOT to build callouses on the hands, but to increase the density of the bones in the hands and, to a lesser extent, in the arms. It also teaches, albeit sometimes painfully, how to execute technique correctly.
Striking a proper striking post should not be especially painful. Initially the padding (which is traditionally made of a type of rope derived from rice stalks) is a bit stiff, but with regular practice it gets much softer...kind of like using a new baseball mitt. Striking it then isn't painful at all and your subconscious will allow you to deliver strong blows because there is no fear of pain.
If you want to develop genuine martial skill with your taijiquan, baguazhang, or xingyiquan, make it a part of your regular daily practice.