Groundwork and grappling training.
I love throws and groundwork.
It's something I didn't expect to be getting into but it's turned into the method that I buzz off getting right and learning new techniques. I'm not sure if it's the norm at all clubs, but each of my gradings include a handful of throws that you have to perfect in technique before you're able to pass.
My white belt included things like a defence against a strangle into an arm bar, scar fold, and hip throw. I found that just drilling every throw over and over again is the best way to get it in your head and perfect every movement. I'm still amazed at the size of people you can throw if you get it spot on; it's like defying physics. It's just something different to actually get on the ground and submitting someone feels unreal.
I'm loving learning the more advanced throws in preparation for my next gradings — I'm currently learning some blue belt stuff, and it all gets more fun as you go along.
Arm bars have to be my favourite move to pull — once someone's in that they aren't getting out. Being small has its advantages too; I've found a lot of the guys just use their brute force to try and win a groundwork session, but I can use my size to wriggle and move around more to surprise them with technique.