noun
upper body
Refers to the part of the body above the waist, including the chest, shoulders, and arms. Used in contexts like posture, exercise, or medical descriptions.
上体を起こして座ってください。
Please sit up by raising your upper body.
彼は上体の筋力を鍛えている。
He is training his upper body strength.
上半身 is more common in everyday speech for 'upper body', while 上体 is slightly more formal and often used in written or technical contexts.
Compound of 上 (upper) and 体 (body). The reading じょうたい is the standard on'yomi combination.