It might be why you're failing at your New Year's resolution, according to a new study.

Woman with phone and exercise ball
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Finding it hard to get to the gym as much as you resolved you would in 2018? Well, you might be able to just blame it on your personality. According to new research, how well you stick to your workout schedule might have to do with your personality type.

In new research presented today at the British Psychological Society’s annual occupational psychology conference, John Hackston, psychologist and head of thought leadership at OPP, one of the world’s largest business psychology providers, found that people were more likely to effectively complete workouts—and enjoy them—if the workout was matched to their personality type.

For the study, Hackston and his team surveyed more than 800 individuals across several countries. He found that those more extroverted were more likely to like exercising at the gym, while those who were more creative preferred unstructured outdoor activities like cycling and running. The people who were most likely to stick to a regimented workout plan were those who preferred objective logic. On the other hand, people who hated having to do the same thing on the same days in a strict workout schedule were more likely to place a high value on feelings and importance.

“There can be pressure to follow the crowd to the gym or sign up to the latest exercise fad, but it would be much more effective for them to match their personality type to an exercise plan that is more likely to last the test of time,” John Hackston said in a statement. “The most important piece of advice to come out of this research is that there is not one type of exercise that is suited to everyone.”

Now that you’ve figured out what type of exercise might be up your alley, you need some tips on how to stick with it. Here, how to start working out (if you basically haven’t moved since Halloween).