There are 6 things you should not do while praying.

There are six things that should not be done during prayer: deliberately speaking, moving around excessively, eating or drinking, exposing one's private parts, changing one's intention, and turning one's back to the Qibla, as these actions invalidate the prayer. Furthermore, there are also things that are makruh (reprehensible), or not recommended, but do not invalidate the prayer, such as turning the gaze or head, looking upward, or excessively scratching.