bipedal walking; walking on two legs
being engaged in two trades at the same time; wearing two hats; having two irons in the fire; (lit.) two pairs of straw sandals
being engaged in two trades at the same time; wearing two hats; having two irons in the fire; (lit.) two pairs of straw sandals
firstly vision, secondly footwork, thirdly courage, fourthly technique (the most important aspects of kendo)