The point of that entire activity is to learn by experience what is doable/not doable with some historic tools, and hence derive, how these tools were probably used. But their learnings aren't very valuable, since it's pretty evident they aren't anywhere near of strength and coordination of a trained person. I would bet a fucking (professional) figure skater would beat them with a stick.
And this is super important, because the supposed original users of a given tool are almost exclusively supposed to be people trained to wield it daily from the childhood. Not to mention they wouldn't spend much time in front of a monitor ever.
The overall fitness level of reenactors isn't great! Granted freely! but: skill does mean something.
Mostly, also -- the people doing the most historical research tend to be the fittest. See: https://www.youtube.com/watch?v=afqhBODc_8U, e.g. are a pretty athletic bunch.
It works so well that you're generally not allowed to do it in the full contact rulesets, because it's counterproductive to break your opponents today; you can't fight them tomorrow!