@AlexOland
Maybe it's just me, but watching a handful of people run around or punch each other on a screen is the most frivolous activity I have ever seen. I find it useless. TV is for sharing the CREATIVITY of others around the world. Even an advertisement was created from scratch, combining the story genius of some and the acting ability of others, amongst other things. I understand the purpose of playing sports for personal skill and enjoyment, but see no benefit or entertainment value. You could watch football every day and it wouldn't help you get better. Every game is just a series of certain movements with constant mistakes.
So, to perhaps be more clear, sports have benefits in your personal life, but nothing that martial arts (an ART, not a sport) or something similar, couldn't accomplish, and these things would have real life applications. I personally participate in martial arts and receive ACTUAL benefits in addition to the physical strength and agility that a football player would gain. 

Sports as a whole are much more than people punching or throwing the ball around. When you learn the rules and watch and see it is clear how much work, and sometimes its a masterpiece unfolding in front of you. Also TV TV is not just to show off creativity, it is to access things you could not normally see. For example TV shows exist because it became better than having to go out and watch a play every night. Sports provide people with entertainment, but also you are forgetting the tremendous amount of jobs created by the sports industry. There are majors that were created simply for sports, sports journalism, and almost all of health sciences. If you said sports are useless, then you would also have to say TV shows are useless, and arguably bring less into the world than sports. 

Sports is a great way of getting exercise and keeping fit that also releases endorphins, adrenaline, serotonin and dopamine that also helps people who already have depression and helps prevent having depression. Plus it helps one keep fit, healthy and active, and thus helps reduce and prevent health complications such as obesity, heart disease, etc.

I believe that sports give people a way to express themselves, in the sane way that artists or musicians express themselves. During my highschool career i saw every group of classmates come together as one to come support our football team. The stands were filled by our AcDec team, English Clubs, and other non athletic groups. This is showing how this sporting event brought together a whole high school, disproving your agrument that they do nothing for the communities and bonding aspects.

Sport is the most important thing out of all the least important things.

RS_master said:

@K_Michael ; Sport is important as it improves your fitness. Running or walking for 30 minutes a day is known for decreasing your stress. Sport gives you less chance of getting cardiovascular or normal diseases.. Sports helps you become quicker and so if a stabber tries to stab you, you can run away more easily.

This is a fallacious argument in my opinion, If sports were developed for the purpose of optimizing your fitness, then it could be argued that it is important. That being said, sports are not developed to optimize fitness, but are created for entertainment. If you wanted to optimize your fitness, you could take an exercise class that is designed to maximize the amount of energy exerted in ratio to fitness advantage gained.
It may be hard to separate exercise and sports in your mind, so here's an example that makes it more obvious.
I could argue that having having sex is important because it burns calories. However, sex doesn't have the purpose of burning calories. So even though sex is important, the argument that it is important because it improves your fitness isn't a good argument.

K_Michael said:

What purpose does chucking that ball (or whatever your sport does) serve? None. Completely frivolous, with no ensured benefit.