◆畳の上の水練 Tatami no ue no suiren.
- 解釈：畳の上の水泳練習は効果がないように、理論や方法だけに詳しくても、実際の経験に乏しいため、役に立たないこと。
- Literal：Swimming is practiced on a tatami.
- Interpretation：Even if it is detailed only to theory or a method, since it is deficient in an actual experience, it is not helpful to them. Knowledge without practice makes but half an artist.
- 類義：机上の空論。炬燵兵法。畳水練。畳の上の陣立て。畑水練。