In his youth, he worked out on homemade weightlifting equipment (later in his life, Marciano was also a client of Charles Atlas) and used a stuffed mailbag that hung from a tree in his back yard as a heavy bag. He attended Brockton High School, where he played both baseball and football. However, he was cut from the school baseball team because he had joined a church league, violating a school rule forbidding players from joining other teams. He dropped out of school after finishing tenth grade.