Question: when did going to the gym became popular

title: Fitness culture
text: Personal trainers act as representative roles that represent the fitness club . It is a kind of representation for customers in term of satisfaction and loyalty to that particular fitness institution . Trainers also act as brokers , or agents , to create a link between the activities of their customers and the purchase of extra goods and services that their customers need for particular activities such as shoes for specific training , clothing , or home equipment . Trainers are also motivators of the goods and services . They are required to have technical skills in order to provide professional fitness services to their customers and they need to have good communication skills meant to persuade their customers to do more in the fitness institution , which in turn means purchasing more goods and services . Finally , personal trainers also act as entrepreneurs : creating a large network of customers for different goods and services in order to produce profits . From this point of view , personal trainers are intermediaries between customers and the fitness institution , playing a crucial role in the commercialization of fitness culture .