There are many online resources relating to the study of history during the 20th century. This list of resources, while by no means exhaustive, provides a basic starting point for your research.
Articles from scholarly journals in the humanities, social sciences, and sciences. NOTE: In many cases, articles from the last 3-5 years are NOT available due to publisher copyright restrictions.
Articles about recreation, exercise physiology, sports medicine, coaching, physical fitness, the psychology, history and sociology of sport, training, and conditioning.