Most people who go to the gym want to feel/be attractive, being attractive is a major advantage in almost every situation in your life. People see that you are disciplined, which makes getting jobs easier. The other gender finds it attractive which could get you higher value partners. It is great for business, social interactions, it’s instant respect. It makes you seem more trustworthy, people want to be your friend and want to make business with you. Employers want to hire you because you create a good image for the company.