It's still not clear to me how they got the hearing loss. According to Mr. Shatner it's from Arena. But in Mr. Kelley's biography it's mentioned that the three suffered hearing problems from a mine explosion while filming The Apple. So...Not quite on topic, but his run in Arena is truly notable in this regard. He throws himself about with abandon, with explosions going off all over the place. I understand this is the ep that led to his tinnitus.
Even Nimoy got into the act!
As for the fights, I like all Kirk's fights as long as they don't involve stunt doubles. Mr. Shatner in this series runs fast (wasn't he a football running back when he was younger?), moves remarkably well and is a better fighter than his stunt double at times. I understand due to time constraints and camera arrangements etc. a stunt double has to be utilized, but it's really distracting whenever a stunt double or a stand-in is spotted. For example in The Devil in the Dark, a stand-in can be clearly seen in the Spock mind-melding scene. Mr. Shatner had to miss this part of filming, but why couldn't that stand-in fellow stand a bit straighter and more captain-like?
