I mean in any Trek series. They only seemed to act tough to me. I mean, how many times did we see Worf get thrown around in TNG (Michael Dorn actually complained that he was being portrayed as a wimp!)

Feats of Strength? Roga Danar physically overcame Worf, so did Riker in an episode

Resilent- with multiple organ backups? Usually they would be killed like anyone else, like in ST6, way of the warrior etc. They never seemed that impressive to me