Everyone knows that regular exercise has numerous physical rewards. Studies have shown that exercise also produces substantial cognitive benefits. Exercise not only improves mood but can be as effective at treating depression as antidepressant medications. Exercise is also attributed to increased creativity and decreased anxiety levels. Consider the positive cognitive effects of exercise next time you think about skipping out on your 2%.
http://www.bu.edu/today/2010/exercise-the-other-antidepressant/
http://bjsportmed.com/content/31/3/240.abstract
http://www.tandfonline.com/doi/abs/10.1080/08917779008248736#.UqAAFMRDvts