Great answer, Carl! Have you done a lot of free weight training? I found it interesting that the OP didn't ask how he could play like ZJ, but how he could get the same forearm definition.
Maybe posing becomes more important than performance at some point. :-D
Yep, the original question was, how can you get definition like ZJK. That was the question I answered.
I should have added reverse flys for the upper back. Pull downs for the lats would be good too.
If the question was, how can I learn to play like ZJK I would not be able to answer that question adequately.
But I sure would love to be able to play like him.
I teach Yoga, but feel it is part of my job to know how the body works. I like using my body in lots of different ways so I use weights some of the time. But I do some kind of working out aside from the table tennis training I do, 7 days a week. So I am always using my body.
Also, I don't know that the amount of weight I mentioned for the exercises I mentioned for getting definition would get in the way of someone's ability to improve at table tennis. But one thing I have found is that, abdominal work helps my game a lot.