Have you ever heard about a runner's high? Or that great feeling people get after a workout? Maybe you have never felt these things. Researchers are now finding out that the reason you may or may not like the gym could be in your genes. They have found that some people have a gene that interferes with the release of dopamine in the brain. Dopamine is the feel good neurotransmitter that regulates the pleasure and reward centers in the brain. If a gene interferes with that, you may not feel rewarded or pleasurable after a workout. This along with your personality of course. It could be considered a case of nature vs. nurture. You can always develop a passion and love for working out, it may just be harder. Just like you can have a gene that makes you more lazy, you do not have to live with it. You can fight it and train your body to be different. You can actually change the way your body reacts to working out. A study showed that a person who hated physical activity began running everyday for a week, and began to actually sort of enjoy it. Their neural pathways improved. This isn't to say they loved it, but it was a small change that could lead to something bigger.