I resent frequently doing tasks/chores for my gf and her sister that I live with
I'm saddened by this. Why do you keep doing the chores if you resent them?
No, I have already had a fight with them about it
Communication is important, so explain what you expect from them and then give them the chance to give their expectations as well.  They are not going to be respectful toward you if you are being disrespectful toward them.
They prefer physical work which I find boring. I would rather read and work out.
I do not know your living arrangement with your roommates, but you should equally divide all the chores in the house so that you won't feel resentful. If you are just resenting your fair share of the chores, then I think it's an unreasonable thing for you to feel, but either way, if you need help from them then the best thing is to say so and communicate with them.