Do not exert force, but the idea is there. Don't use muscular force, however be in such a position and will the existence of the optimum peng path, the path that requires the very least muscular effort. Action and idea should be in harmony. The idea and energy should be in agreement. Those same movements of the body should be such that the body always presents and uses postures which optimize the use of the peng jing.
Action is included in inactivity.
Action and inactivity should be well coupled. All movements should be performed in rhythm and follow one another evenly without any jerky motion, as silk is drawn from cocoons. Allowing and training your motion to always be connected together is the way the body is used in Taiji.