Taylor Swift -- Terrible MMA Fighter (Video)

She's the songbird of our generation ... but Taylor Swift can't fight for a damn.

Swift posted training footage for one of the fight scenes in her video for "Bad Blood" ... throwing punching, executing neck strikes and (in a move that would make Cobra Kai proud) SWEEPING THE LEG!

Look, Taylor is no Ronda Rousey ... but she can sing, dammit.