The Grownup Ninjaz course is straight out of American Ninja Warrior, which means it is super hard. We got a walkthrough from a supervisor which was nice, but it doesn't look like that's always available. I'm pretty sure I hurt my shoulder doing the salmon ladder but it's fun at the time, of course. PursuitOCR is way more do-able.
WARNING: Make sure you bring your shoes in a separate bag because they don't want your wet slushy feet on the equipment. That makes sense, but they don't warn you of this on their website, so pay heed!