There are obviously a lot of guys here that have racked up some serious time in combat sports of all varieties, training under/with some excellent coaches and fighters.
I thought it would be interesting to start a thread where we could all post some of our tips/exercises/programs that we feel give us an edge in some way come competition time. For example, Sento mentioned that he'd trained under Charlie Lysak, who is the only man to have closed the COC#3. Sento - you must have some great tips for building the grip (inexpensively, as you mentioned). It's something a lot of fighters might not train seriously, relying on their sport specific training to build what they see as the necessary strength. So what would you have one of your fighters do, and how would you set up a mini program for him to train it?
For me, when I started boxing, and I got hit hard and got dizzy, I didn't really know how to respond to the disorientation, and I immediately, subconsciously, accepted that I was in deep water, which took me out of my game plan and handed the edge to my opponent. I actually lost a couple of early fights just from not knowing what to do when this happened. What has really helped me, and many fighters I've trained with/helped coach, is doing some tumbling, followed immediately by shadowboxing or 8-count body builders, or something else that forces you to coordinate your limbs when you are dizzy.
I saw Kosta Tzyu doing something similar in this video:
I know that a lot of fighters do none of this sort of training. It doesn't take long - 5 minutes at any time of day is enough - but in my anecdotal experience it is something that can make that tiny bit of difference that lets a fighter stay in a fight when he might otherwise be about to go. I certainly feel it helped me.
It'd be interesting to hear what other people do that they think gives them an edge in some small way.