Yeah I love Devilman Crybaby deeply (it’s one of my favourite anime of all time), but good god it can be hard to watch. While I love it to bits I don’t think I’m going to sit down and rewatch it for a very long time (if ever) simply because of scenes like the one with the runners you describe and the club scene in the first episode. The show is hyper-violent and brutal to the extreme, but in Devilman Crybaby that off-putting, purposefully disturbing and upsetting ultra-violence actually works in its favour. It’s rare that a piece of media can be that violent and deeply upsetting while still being engaging and impactful.