Wrist curls....Just like you said, I hear "time for some water."
I used to think the same thing until I broke my wrist. Now I am PROUD to be able to do wrist curls again, and do them with any substantial weight. I did Cathe's GymStyle Back/Shoulder/Biceps the other day and was just pleased as punch when I could do those wrist curls with the same wieght as Cathe. A huge milestone for me in my recovery!
That said, if an exercise move is in a workout, I do it whether I like it or not. I figure it's there for a reason. I can't expect to get the results I want if I'm skipping any of it. I wouldn't be cheating anybody but myself.
I have mixed feelings about calf work as well. I usually won't skip it completely but in endurance work outs where the reps are endless I am usually forced to stop early because the pain/cramping is just too much!
Wow, lots of votes here for what have become 2 of my favorite exercises...mountain climbers and burpees!!!
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This is a good point. Now you're making me feel bad for skipping those dang burpees/mountain climbers!