The number one reason people fail to stick with an exercise regimen is that they are not exercising according to their fitness personality, according to Linda Shelton, fitness director of Shape magazine. Shelton has identified five distinct fitness personality types. Which one are you?

These are the most reliable, stable and predictable exercisers, who thrive on routine. Squares tend to develop rigid schedules for themselves, so while they get to the gym regularly, they don’t see progressive results because they hit plateaus doing the same thing over and over. Advice: Squares should try a new activity weekly and switch up the routine just a little while still pursuing the familiar schedule and practice.

Although they are a little more flexible than squares, rectangles still thrive on order and routine. They especially enjoy group exercise and perform best with social interaction. Advice: Join a fitness club, running group or hiking group or take fitness classes instead of exercising alone.

Competitive and driven, triangles are task-oriented and thrive on repetition when they are working out so they can monitor their progress and revel in their successes. Advice: Since triangles need to have exercise goals, find another competitive partner and train together for a specific event, or each of you can set individual goals and compete against each other to be the first to reach it.

As the social butterflies of the exercise world, circles are emotionally driven. They are spontaneous, fun-loving and will not exercise alone. They love group exercise and really enjoy being with a trainer. Circles are the most common type among the fitness personalities. Advice: It’s easy for circles to spend more time socializing than exercising, since they like the camaraderie more than the workout. Either seek out a nurturing trainer who will motivate, but not push too hard, or exercise in a group setting.

Outgoing and fun-loving, squigglies hate routine. They are the polar opposite of squares. If an activity is not totally fun, enjoyable and exciting, they’ll quit. Advice: Create a varied exercise plan that includes classes and new activities.