Physical education and training. Physical fitness 12 Relation to psychology. Sports psychology 6 Coaching 5 Games and amusements 4 Sports 4 Ball games: Baseball, football, golf, etc 3 Athletic contests. Sports events 2 Football 2 Physical measurements. Physical tests, etc 2 Recreational areas and facilities. Recreation centers 2 Customer services. Customer relations 1 Data mining 1 Detectors. Sensors. Sensor networks 1 Diseases of the circulatory (Cardiovascular) system 1 Exercise 1 Experimental psychology 1 Expert systems (Computer science). Fuzzy expert systems 1 Football games 1 GV Recreation. Leisure 1 General works. Athletes 1 Human physiology 1 Information technology. Information society. Digital divide 1 Leadership. Transformational leadership 1 Musculoskeletal system. Movements 1 Physical education facilities. Sports facilities, Including gymnasiums, athletic fields, etc 1 QM Human anatomy 1 Rowing 1 Sports Medicine 1 Testing. Evaluation of performance 1 Web-based user interfaces. User interfaces (Computer systems) 1