Penang Retreat Nov 2019 Q&A Group 4 Round 1 (1:12:10-1:12:55)
Yogi: Is the tension in the body always due to defilement?
Sayadaw: The body becomes tense not necessarily due to the defilement – hardness and softness are the earth element (rupa).
Changes in the body can be due to any of 4 causes: mind, the effect of past Kamma, nutrition, and temperature. So, they need not be caused by the mind.