You nailed it. I've played sports and done all kinds of workouts, but so far, this warmup has me doing things and working muscles in ways I never have. Fatigue sets in, especially since I try to push myself instead of saving myself through the warmup for the actual lesson.
And it's no fun to have someone get the best of you, especially if, as a white belt, I have a limited pool of resources to pull from. It's humbling to have someone who I wouldn't think twice about getting into a confrontation on the street handle you like it's nothing, because they know what they're doing and I don't.
Aside from that, I think the hardest part is feeling awkward and dumb trying to remember moves and execute them. It just adds insult to injury when you look like you don't know what you're doing and then the person on top of you confirms it. Having the mental fortitude to shake it off and come back the next day is tough. Especially since the "good" lessons are so energizing. Gotta deal with the ups and downs I guess, and not be too proud to look foolish while learning.
As far as what they have me working on, I've done mount escape, escape from a choke from behind, side control escape, a sweep when sitting on their hips, double leg takedown and a few other things. Today we learned an escape from (I forgot the name of the hold) the position where your opponent is toward your upper body and squeezes your head and neck with their bicep like it's a scarf.
