Tuck
Sports Dictionary
Lichtenberg: "To try to do everything at once is to do nothing."
– a position in which the body is bent - knees to shoulders, elbows pressed, shins grabbed. Different terms are distinguished: lying tuck, sitting tuck, and squatting tuck, wide tuck.
Related to terms indicating acrobatic exercises
Lichtenberg: "To try to do everything at once is to do nothing."