The yoke had the biggest influence on my training. My very first competition, I showed up pretty cocky. I had just won best lifter at a meet 9 months before with a 601 dead and 502 squat as a 181 lifter, and had a solid overhead press. I thought for sure I was going to do great in strongman without even trying. The yoke was 500lbs, and I thought my squat was going to give me an advantage, and that the weight was going to crush the other competitors. I then saw dudes practically sprint with the damn thing, while I took a bunch of lumbering steps, kept hitting the front skids, walked sideways a bunch, etc etc. It was a disaster, and ultimately the wake up call that strongman was WAY different from powerlifting and I was gonna need to wise up and get good if I wanted to do well in competition.
The yoke was also the implement that blew out my knee in 2015. I was having an amazing training year at that point and felt pretty much unstoppable, and that moment helped me learn that I was human. Good for humility.
As for the second point, Jim Wendler has probably been the biggest influence on my training approach. It took a LOT of re-reading to finally “get it”, but I have a much better appreciation of how to program training, how I don’t need to test all the time, the value of sub-max lifting, etc etc. @Alpha of course gets honorable mention for constantly setting the bar for what can get done if you’re crazy enough.