Thew, n.

(thū), n. [Chiefly used in the plural.] [A-S. theáw, tháu, thaw.]

1. Manner; custom; habit; form of behavior; qualities of mind or disposition. [Obs.] “To be up-brought in gentle thews and martial might.” Spenser.
2. Muscle or strength; nerve; brawn. Shak.

And I myself, who sat apart And watched them, waxed in every limb; I felt the thews of Anakim, The pulses of a Titan’s heart. Tennyson.