But if you decide to swim into the deep end of the pool, ask yourself why.

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For sure, the Manhattan skyline is an exhilarating part of the swim, not least because it means the end of the marathon is near.

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Giving permission to a group not elected by citizens, Handy said, means they could end up with a Hollywood Slots swim team or an Oxford Casino track field.

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Adrian deserves the credit for his stunning come-from-behind victory over Magnussen, but the end result is just the latest of several disappointments for the Australian swim team.

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"The last thing I want to do is for them to get to the end of the summer and feel like all they've done is swim, " he said.

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She visits the Brain Science Lab at Indiana University, which studies the hard- swimming members of the US Masters: men and women who swim 3, 500-5, 000 metres three to five times a week, sometimes for decades on end.

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