While it’s probably not the WORST addiction to have, an addiction to exercise is still an addiction, and it still has consequences – like continuing to work out despite an injury, obsessing over caloric intake and daily weight, and strain on relationships and schoolwork or job performance. These addicts sometimes work out over 2-3 hours a day, which is a lot of cardio and strain on your body. Some estimates say that up to 10% of high performance runners and body builders are addicted to exercise. While sometimes this stems from a need to be in control, it can all be as simple as an addiction to the “high” we get after intense workouts.