The first insurance policy became available in 1850. Physical education became a focus in 1870 after France lost Alsace-Lorraine to the Germans.
Physical exercise and strength became popular due to fitness journals, photos, and exercise clubs being opened for everyone to attend. Fitness competitions began in 1903. Olympics cancelled due to World War 1.
Charles Atlas became popular because he won fitness competitions in 1921 and 1922. Psychologists studied how important a child's physical activity is to their learning.
World War 2 caused shortages of rubber, wood, and other materials. People began to make balls different, change how bats were made, and change sports in general to fit the supplies they had available to them.
Professional football became the most popular sport in America in the 1960s, surpassing baseball in television views and attendance. The physicality and fast pace of football intrigued people.
Monday night professional football games began in 1970 and Thursday night games began in 2006. Studyingbiomechanics became popular so that athletes could improve in their sport. Physical education became mandatory by the government until 9th grade.