my personal theory is that after practice, my brain is automatically synthesizing and integrating the content of the practice.
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All the feelings of discomfort, discontent, boredom, loneliness, are important to the process of training. The mind will usually seek and grasp at any kind of stimuli to distract from all those feelings, and basically protect you from the less comfortable parts of the growth process.
There is certainly something to be said for the idea of occupying one part of the brain so another can focus, but it is still a kind of self-bullshit. In the short term it might feel more effective or comforting but in the medium to long term it is just a detraction from cultivating the whole being (body + mind).
There is a lot going on under the radar, under the ocean's (brain) surface. I won't pretend I know what all of it is, but I know my experience with practice which is that it is always very mentally active, and that is usually at once very distracting (challenging) and part of the practice, part of the work to learn to focus. It is also active in other ways that I think I only realize after. My approach is that if you must have words in your head during practice it is better of they are your own (or your teacher's henpecking instruction echoes). If you must have music in your head it is better if it is the sound of your local environment, perhaps you can increase your auditory awareness (situational awareness) and become more merged with you energy of where you are?
The way we were taught was to pursue an all encompassing commitment to intention, awareness and spirit in movement. To put it simply, this cannot be accomplished with intentional external stimulation and entertainment. Providing that kind of comfort exception to one's self during training is nothing other than shortchanging one's own development.
That said, if you have already had your big practice of the day and are then wanting to fit in small moments of drill, mechanic or fun/research movement during the busy rest of the day there is nothing wrong with having other things going on while you play around with stuff. I have kids, the TV might be on, music might be on, I might be annoying my wife standing in the middle of the kitchen messing around with Lanzhayi, just generally being in the way and distracting myself while obstructing others, it accomplishes many goals and contributes to a general sense of family discord.
But on the other hand, panting, profusely sweating, and growling are not things I associate with meditation either.
This is definitely part of THIS type of meditation. While other meditation practices may remove many stimuli to achieve emptiness, peace etc. In our case we are increasing duress and stimuli and practicing focusing and hopefully achieving 'emptiness' with those challenges in place.