We tend to think of the legs as two vertical columns supporting a lintel – the pelvis – from which the spine rises. Instead, think of the feet/shins/thighs/hips/sacrum as an arch, each element a voussoir with feet as springers, and sacrum (the only element not paired) as keystone at the apex. This is the sense in which thinking is good – bearing in mind better concepts in order to correct bad habits and improve awareness. In fact, thinking is never wrong of itself – what is wrong is the inability to turn it off when no longer appropriate: worry and anxiety.