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.
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.
a pair of feet would be a start.
because they just do
There are weight training programs for children, and you need to ask your parents about it.
he needs to run as fast as he could
To be able to "bend it like Beckham"