Bio break refers to a general break for one's body: stretching one's legs, going to the bathroom, getting a drink of water, etc. The term is generally used during meetings, presentations, and other workplace occasions1.

Bio break（字面意思為生理休息）指讓身體稍事放松的小憩時間，大伙可以伸伸腿，去下廁所，打杯水等等，這里譯為會間小憩。這個詞多用在會議、演示講壇等職場活動中。

For example:

Let's take a 10 minute bio break and be back in our seats at 3:30.

大家會間休息十分鐘，請在3點30分回到座位。