tanran (坦然, tǎnrán) is a Chinese word. It means calm; unperturbed; with no misgivnings.
If you think that participation in yoga courses is like buying mineral water in a bottle, then the knowledge of the best health qigong, Baduanjin, is like a magic mug that changes ordinary water into mineral water. (tanran.se)
If you learn some simple and effetive exercise that you can do wherever whenever, it is like you obtain a tool bag for your health.