Same here. I drove most of the weekend and ended up with bruises on my arms. I guess it was my crewing whipping me into shape...
You're pinching - smack!
Your footing - smack!
Nice mark rounding - smack!
Yeah, well, I too complained of being tired of Saturday but was quickly questioned as to why since I didn't do any of the string pulling. I replied that all of that brainpower needed to get around the course fast required a lot of calories.