When playing on a swing, you don ’ t want your legs moving at random, but together in rhythm. When they do, it takes little effort to swing high. He argues that synchronizing one ’ s breathing with pulse, blood pressure, etc.
他以盪鞦韆為例，不必雙腳使力亂蹬，只要抓準節奏，在適當的時間輕巧出力就能盪得很高，呼吸與心跳、血壓的共振亦然。