Woman doing Exercise with Hamstring Stretch for back and leg Muscle Relaxation. Illustration about exercise diagram. 株式会社なにわサプリ > NANIWA SUPLI MEDIA > ダイエット > どうせやるなら「痩せる」ストレッチ。 気持ちいいだけでじゃもったいない!! > Woman doing Exercise with Hamstring Stretch for back and leg Muscle Relaxation. Illustration about exercise diagram.