Goalkeepers going up for corners.
Why does the keeper always run into the opposition team's area in these last-minute situations of there is a corner or a free-kick?
Obviously I understand the value of having as many players in there as possible, but why the keeper?
Usually there is one defender left on the half-way line anyway. Seems to me it would be more sensible for a defender (more experienced with heading the ball) to go up, and the keeper stay on the halfway line, able to put the ball back into the area if the opportunity arises, but also closer to his own area if something goes wrong.
Or is there some reason I'm not seeing?