Answer: This is a fairly good initial state of meditative concentration. When meditative concentration first arises through practice, the body within the concentration is not easily able to move freely; it feels very stiff and cannot turn or move. If one forces movement, either the mind feels uncomfortable or some part of the body feels uncomfortable. After entering meditative concentration many times, one will become accustomed to it, and the body can then move much more freely—able to move when one wishes to move, without constraint. To be able to enter and exit meditative concentration freely with both body and mind, one needs to continually cultivate meditative concentration; with proficiency it will be fine. Static meditative concentration is easy to cultivate and easy to maintain, while dynamic meditative concentration is not easy to cultivate, and even when it arises it is not easy to maintain. Only when meditative concentration has deepened can one maintain some degree of dynamic meditative concentration.
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