How do you say "do a plank" in Chinese?
The position is called:

平板撑
ping2 ban3 cheng1

平板 meaning literally &quot;plank&quot;, or &quot;slab&quot;, and 撑 standing for 支撑 &quot;to prop up&quot;.
The longer form 平板支撑 is also common.

About the verb &quot;how to do&quot; a plank, that would be simply 做 but also 完成 might be fine.

如何完成平板支撑 How to do/complete planks