Physical Activity is any movement of the body that requires the muscle to do work. One possible way to track that activity is through Electronic Fit¬ ness Trackers. Fitness Trackers are wearable devices that track steps , calorie intake and expenditure, and workouts. By having a tracker , users are able see their true day-to-day activity level and can then use the tracker set goals to im¬prove. Little prior research has been done on fitness trackers , as they are a rela¬tively new technology , and that which has been done has focused mostly on validi¬ty of measurement. Further research is necessary to determine the effectiveness of trackers on motivating users to increase their exercise levels.