Cannon

I've always found fictional cops and private eyes with names like "Bullitt" and "Magnum" ridiculous.

I've watched a few episodes of Cannon, the old private eye show. A guy named Cannon isn't quite the same as one named Bullitt, Magnum or Gunn. Frank Cannon was played by William Conrad who was terribly overweight. I saw episodes of the show now and then when I was a kid, but I didn't realize it was an action show. Cannon fights, uses Jiu-Jitsu, shoots people. He runs.
I thought he should have had a bigger gun. He uses, like they all did back then, a nondescript snub-nosed .38. They should have given him a gun with a longer barrel. He couldn't be expected to run after people, so he needed to be able to shoot them from a distance as they ran away.

He drives around in an enormous 1970's Lincoln Continental. They're impossible to park and it would take about two minutes to turn around in one which would be a serious impediment if you were trying to follow somebody. The landau top wasn't doing him any favors creating terrible blind spots.

And then there were the '70's clothes. Clothes were tighter back then, and when a guy's already overweight, he just looks really, really uncomfortable. Wearing natural fibers wouldn't have hurt anything.

Be open to action stars who aren't big muscle guys.