The dantien needs to be worked, physically, muscularly, like any muscle, with impassioned sequences of belly contractions alternating with lumbar spine extensions – bowing then arching the spine – pelvic rocking. The passion, the intensity, comes from the connected continuity through the sequence rather than the force exterted, and so can be done anywhere at anytime: whilst walking, waiting, reading, even conversing. Driving is ideal because the exercise also improves posture (we all tend to slump as we drive, unless you have a good bucket seat) and brings the mind to attention, to a place of cold, quiet vigilance; a mood we call ruthless.