Physical activity is defined as any bodily movement produced by skeletal muscles that requires energy expenditure. If it is physical activity that someone does regularly for enjoyment rather than work we call it sport. It is such an elementary part of our lives, that some say movement is live and life is movement. The list presented here is my personal summary of some of the top reasons for doing sports. It is based on observation during my work as a fitness trainer in the gym and as a lifelong active athlete in many disciplines.