修練、切磋琢磨、鍛練、体練、精練、修錬、鍛え、修業、調査、検討、勉強、研究、書院、稽古、修行、練磨、研磨、研摩、研鑽、練習、訓練、トレーニング、猛練習、猛稽古、猛特訓
Shugen, friendly competition, forging, physical training, refinement, investigation, examination, research, Shoin, kneading, polishing, grinding, kenma, intense training, practice,
