What are the arguments for/ against it stopping the Chi flow? How exactly can a Chi flow be described? It isn't just Tai Chi that is split over the use of weights. A lot of martial artists are still stuck in the days of false information, usually sprotting the old, "it makes you big and bulky and slows you down" line which simply isn't true if you train correctly for what you need. As for being balanced, I have seen many martial artists from different styles that have trained many years try certain exercises, thinking they are well balanced, when in fact they are not. They realise that they have been compensating all the time, not knowing it. A common thing is someone that thinks because they can do a press up they can bench press. When they try the bar goes all over the place because one side of their body is stronger than the other. They can't control the bar. Just a silly example, but I've seen it hundreds of times, even with very little weight on the bar. Another example is when people do chin-ups. Not many people can do them without a 'wobble'. It was said to me once that a 100m sprinter will only get so fast doing just the sprint. Running up and down will only get him so far. There will come a point where he won't get any better, no matter how many times he runs. He will eventually need that something extra. (Maybe sprinting was a bad example, because that 'something extra' is drugs!) They will hit a wall they can not get past. They need other training, which the best do. They don't just run. I think this applies to martial arts. Just doing techniques over and over will only get you so far.