The expression “Go for it!” is a way of encouraging someone to try something. What’s the meaning of it? “Go for it!” means you should not worry about failure or be too careful. You should take a chance and be brave.   But it is not the football played in most countries such as England, France or Japan, but the kind of football played in the United States and Canada.
One of the most exciting times in football comes when a team has failed, after three tries, to move the ball forward ten yards. The worst choice is to kick the ball and accept the present failure. You do so in order to get a good position for your team the next time when your team gets the ball. The more exciting choice is to try a fourth and final time to get the remaining yards needed.
 Some will shout, “Kick the ball!” But others will encourage the team to take a chance. “Go for it!” they will shout loudly.
In the 1980s, people began using this expression in many kinds of situations to encourage someone to be brave.
  No one knows for certain. But that is the chance when you decide to go for it. You put your bad feelings behind. You choose courage over safety. You hold your breath and go for it. These are the most important.

A. The team must make a very important choice. B. People now are certain to shout their advice. C. Will the action “Go for it!” succeed or not? D. “Go for it!” gets its name from football