The following Video summarises the 4-3-2-1 formation and slight variation on the 4-3-3 prescribed by the National Curriculum.  Also called the ‘estilio de juego’ by the Spanish FA. This 4-3-3 video is also a good watch  

Development phases in a football program Richard Alagich Richard gained his qualifications as a specialist football Coach from the University of Zagreb, Croatia. He has authored five youth development books, endorsed worldwide by members of the FIFA Technical Committee. A common question that I always get asked in youth development is at what age should football
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