We are involved in youth testing internationally. We want to try to prove without a shadow of a doubt the relationship between physical fitness and health not just physical fitness and ability to perform.
Now I say that if you run more than 15 miles a week it's for something other than aerobic fitness. Once you pass 15 miles you do not see much further improvement.
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I've had one very bad ankle injury but otherwise I've been incredibly lucky with my fitness. I've worked hard at it and I've always been fit even compared to other players. That sustains you through various parts of your career but I am 36.