Since the hanao must be gripped between the toes to hold on to the zori, they are thought to be good for strengthening leg muscles, forming the arch of the foot and preventing bunions.
鼻緒を挟み、台を踏ん張るため足の筋肉が鍛えられ足裏の土踏まずの形成や外反母趾の予防にもよいとされる。