Because during a match they are running around the pitch for a lot of the time, constantly moving. Towards the end of the game they get tired or suffer from cramp, so circuit training is important to help them last longer and improve their overall fitness.
All sports people need exercise to stay fit, so that is true for footballers. If they don't, they will not be fit and will take longer to get over injuries. They may not be chosen to play for the team if they are not fit. So it is very important that they exercise.
It is important because soccer players need a shitload of endurance to play
Your ability to produce force is directly related to your speed, power, and performance.
because they do
yes they do
skills & fitness
/This answer will need to be improved/ Before puberty starts, weight training is terrible for your bones.
footballers need good balance so they don't fall over when they have the ball.
lose weight and build up
This is really a question you should be asking your coach. If your coach requires that you do weight training at school, then yes, you do need to do it. If you're already doing adequate weight training on your own, then he may waive this requirement, but it's also possible that he may prefer you do it under his supervision.
About three hours a day, none the day after a match.
There are weight training programs for children, and you need to ask your parents about it.
a pair of feet would be a start.
because they just do
he needs to run as fast as he could
because they will be tired the next day!