Moving During Meditation When I feel dullness in meditation, I tend to move about on the chair, e.g. tilt forwards or backwards, change position to prod myself to wakefulness.

Would such a method be detrimental? Should one aspire to remain completely still during meditation?
If you experience dullness, it's because your thinking mind (little mind) has gotten bored and is trying to put itself to sleep. You can alleviate the dulness by movement, sure — there's nothing wrong with that, exactly — but it's a sideways transition. The more productive approach is to recognize that your thinking mind wants to go to sleep, and that you can detach from it and let it sleep while you remain alert and awake. The thinking mind is just confused: it thinks it's you, and that if it goes to sleep you should go to sleep with it. All you need to do is break that association.