Arrow has good-ish fight sequences and I'm pretty sure Amell, as jacked as he is, isn't a big brawler in real life.
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Yes, but Ammell is also a lot more physically capable than regular actors. He's not martial arts expert, but he still can do a lot more than typical actor can. Also, while I like Arrow, it's clearly low budget and it's fight scenes aren't exactly amazing. We forgive it because it's CW show, but we will expect more from Netflix. A lot more.
It's easier to teach choreography to somebody who can act than it is to teach acting to someone who can fight. And also, way more important.
Maybe, but also a action series will do better with a lead who's merely decent actor, but a great fighter than the other way around.
Acting abilities aren't really that important in such stories. They count if the actor is bad, but once you reach the "good enough" point it's pretty meaningless just how much actor can go beyond that.
Now, don't get me wrong. I don't recommend getting somebody who can't act just because he moves well (I honestly don't remember Ray Park in anything, I just threw his name because he was connected with Iron Fist movie long time ago). But if you can get an actor who can actually fight, while still being able to act well enough you could end up with something truly incredible. Adkins is a rare case of somebody like this, especially if he gets under a good director, which Netlix series will undoubtely have