The article concludes: “These findings support the hypothesis that individual workload and playing style can place additional strain on a player’s body. That included Jamaican twins Art and Asher Welch, and Dennis Viollet, then Manchester United’s all-t. Bill Cox popularized the game in New York City with his International Soccer League. He watched firsthand as the league his father bought into for $2,500 in 1933 became a multi-billion dollar, year-round business.