Markus can actually take some punches, more than I expected from his flabby gut. But the punches after 0:55 got him nicely.

Hey man,
Believe me, yes I can take some punches and kicks and stomps lol

Could you also take a moderate-force punch to the solar plexus with your abs fully relaxed and your eyes closed, i.e. not seeing it coming and getting caught off-guard?

Yes, of course I can. Actually I've received some unexpected punches from Daniel on my videos. I'll produce something with eyes covered next time!