Not a specific exercise per say ... I can't stand basically any exercise in a gym. People in gyms always remind me of hamsters in one of those really fancy colorful plastic cages with the running wheels and climbing tubes and such. Watch the zoo humans play!
I am not a hamster.
I try to exercise outside or at home. Outside the gym I don't like exercises that require a lot of equipment. I like to use body-weight or home-made equipment or the environment (trees and such).
As much as I might want to be done with an exercise while I'm in the middle of doing it, I am always pretty aware of the fact that it is AMAZING to me that I'm doing this stuff. 6 years ago I was obese and completely unfit. Now I can do 100 burpees or 100 push ups or box jumps or lunges! That feeling is enough to get myself through any of them.
im really strong, and im really flexible, so i like doing those things and if left to my own devices, thats all i would do. what i HATE doing is anything cardio, and anything balance or explosive power related. if it wasnt for my trainer forcing me to run, do box jumps, jump rope and burpees, spinning, etc. i would avoid it like the plague. i have a low center of gravity and am firmly rooted to the earth! in ayurveda, im 100% kapha! but, as is true of all things, i do know that i will get the most benefit out of the things i find most difficult.
Running any distance (rugby-damaged knees), Medicine Ball of Death (something my strength coach dreamed up - it's as bad as it sounds), anything involving "engaging the pelvic floor" (seriously...have we become that messed up that we need to consciously clench our nether regions before we do a sit-up or lift a bag of groceries?).
I hate anything that's repetitive in one place. I don't mind doing tabatas on a stationary bike because I can get them over with quickly. I started swimming and I can only go back and forth for 20 minutes before getting bored.
lateral box jumps...ugggg. Not only do they really suck, but I'm not particularly good at them. That being said, I try to do the movements I'm not good at more often. I think it will not only make it suck less, but will really help balance my fitness in the long run.
i used to hate deadlifts and squats but nowadays they're my faves. these days, my old fave, the bench press, is my hated exercise. probably more because it's not going up like the rest of my lifts are. oh well. weighted pullups can be a biyatch too if done right after heavy deads.