Professional footballers should know what to do. All they do all day is train or play football! Most of us on here have played to whatever level. They get a corner, you say "i'll get him" or "you mark him", etc. Imagine being a professional footballer and all you have to do is defend.... They get paid plenty money to do it! I think what I'm trying to say is regardless of what happens in training, we should be able to defend. They also have the advantage of videos, people watching the opposition.