Zanshin

Pronounced, “zan-xin” (残心). A term used in Japanese martial arts that refers to the mental state of relaxed alertness. It is the art of attention and focus of the mind, body and surrounding while being relaxed. Zanshin allows one to be calm and prepared in face of an opponent or adversity.

Reference:
Elias, C., & Arantes, P. (2019). Suspending space and time: The body under the lens of the Japanese concept of Ma. International Conference on Human-Computer Interaction, 11576, 127-143. https://doi.org/10.1007/978-3-030-22577-3_9

Malik, S. (2018, August 14). How to really sustain focus, according to one Japanese martial arts method. https://www.forbes.com/sites/forbescoachescouncil/2018/08/14/how-to-really-sustain-focus-according-to-one-japanese-martial-arts-method/?sh=1a6555a15fe1