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Safety first: Wear a helmet and stay hydrated
(hexbear.net)
Finally, a comm for that one user who hand-makes longbows. This ones for you, comrade.
Harness on that ladder? No, they do not.
Edit: but, that is not an osha approved method of using the ladder and I'm pretty sure osha wouldn't approve a homemade ladder.
Looking more closely at this ladder I see the rungs are narrower on the horizontal, I guess to give more strength to the side rails. But the area for your foot appears to be 1" wide at most and possibly been rounded for a nice finish.
OTOH it looks to have been constructed on purpose to be used this way because generally ladders dont have matching rungs on each side. Presumably to discourage such useage.
I would agree, it looks like it was made this way. I'm not saying it's unsafe, just, OSHA would probably be unhappy about it