Here is a short video of my main hewing axe in action. It works beautifully due to the efficient distribution of steel in the head, and very very slight convexities on the back of the blade, which at first glance appears completely flat. Follansbee explains it better with a steel rule against the back of one of his axes: https://pfollansbee.wordpress.com/2012/12/13/the-endless-look-at-hewing-hatchets/
The set-up is not ideal, I would not recommend a low unsteady chopping block like that (notice my right leg twitching…). However I have been using axes constantly for years now, mostly for axing out bowl blanks, so know how to make this work safely. If I have 30 mins spare some time I’ll put 3 stout legs on that block of wood though.