expression, godan verb (-su)
stretch oneself; unbend one's body
Used when someone straightens their body after being bent or curled, such as stretching after sitting for a long time or waking up.
朝起きて、まず体を伸ばす。
When I wake up in the morning, I first stretch my body.
長時間座っていたので、立ち上がって体
I had been sitting for a long time, so I stood up and stretched.