I have ADD and depression. Although exercise helps its not the total answer for me. the stimulants at low doses really help with complex 3D thinking. but then again, time spent biking requires no stimulant, so on weekends and some days when I go to "sneak" in a longish ride, I don't need any medications. my doc says thats pretty typical, as physical activity does not requre higher brain funtining and the eht exercise kind of kills off any hyperactivity issues.