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The game of football has become more and more complex，due to the various systems constantly introduced and this has made more demands on players and especially coaches． The game demands wider range of involvement，due to the fact that the challenge has become greater．
足球比赛因其阵型不断变化而变得越来越复杂，这对球员尤其是教练员提出了更高的要求。同样，因其面临的挑战越来越大使得比赛所要求的方面也越来越广。
Unlike the WM － System，where the players have specific tasks to perform on the fields of play，there has been continuous involvement of more players in executing more tasks，and this has reached a complex stage presently in the present systems，where all the players are involved in attacking as well as in defending． ［1］
不同于WM阵型中球员们在比赛中有具体的任务，现在的比赛阵型达到了一个复杂阶段，比赛中更多任务的完成会不断的涉及到更多球员参与，而且要求球员既能进攻又能防守。
With this complexity，the demand has become great． The tactical aspect must be improved，the physical aspect to perform must be always at its peak，and the players must also fulfill the demands of the game，in order to show more variety，and surprises to beat opponents and to score． Therefore coaches must be aware of these changes and have to adjust to the situation in planning their training programmes and whilst coaching the players．
由于这种复杂性使得比赛对球员和教练的要求变得越来越高。为满足比赛要求，球员须提高战术并保持体能最佳以变换招数并出奇制胜击败对手。因此教练员在指导球员时必须意识到这些变化并在制定的训练计划中体现出来。