noun-modifying (irregular)
Describes a body, muscles, or physique that is tight, well-defined, and without excess fat. Also used for things that are compressed or compact in form.
彼は引き締まった体をしている。
He has a lean, toned body.
毎日運動して、引き締まった筋肉をつけたい。
I want to build firm muscles by exercising every day.