A Swordsage can opt to take these alternative class features:
Unarmed Swordsage: A swordsage may give up their ability to wear armor in order to gain an improved ability to fight unarmed.
Replaces: If you select this class feature, you do not gain any proficiency with light armor.
Benefit: The swordsage gains the Unarmed Strike ability, as a monk of his swordsage level. This includes the ability to make attacks with any body part, deal lethal and nonlethal damage interchangeably, act as both a natural and manufactured weapon, and deal improved damage based on his level.
The swordsage also gains Fast Movement, as a monk of his swordsage level.