Developed by Russian researcher Leo Matveev, it is an approach designed to prevent overtraining and result in peak performance.

BBC: Total fitness from the land of Total Football

If you go too far, however -- either with extreme short-term activity or long-term overtraining -- the immune system weakens.

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He has long argued that fatigue due to overtraining is the cause.

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"You can only push the envelope so many times, be intense for so long, " said Hall, who blames some setbacks in his career on overtraining.

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He does not recommend training to failure or maximum intensity every time you work out, as this will lead to overtraining, which could lead to injury and fatigue.

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From analyzing trends to preventing overtraining and risk of injury, the micoach Elite System will help maintain optimum levels of player performance week in, week out throughout the season.

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Rather than improving, they started getting injuries and overtraining.

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He believes as many as 80% of injuries are preventable, arguing that fatigue due to overtraining is the cause, pointing out that 14 of the 23-man 2010 Dutch World Cup have already been injured this season.

BBC: Total fitness from the land of Total Football