also: たいいくすわり
sitting with knees drawn up and arms wrapped around them
A seated posture often used in Japanese school gym classes, where one sits on the floor, bends the knees, and holds them with the arms. The term is widely understood in everyday contexts.
In gym class, we first sit in the 'gym sitting' position and listen to the teacher.
The children are reading picture books while sitting with their knees drawn up.