She told BBC Radio 4's Today programme it was important that a boy's mother was not only in good physical condition, but that she had a positive outlook and the dynamism required to give him the best possible start in life.

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He's in good physical condition.

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But Mrs Low was back with us very quickly, Richard Low a few hours later, and as I say they're both in remarkably good physical condition and they, it's the only hard evidence I have, they are not suffering any obvious ill-effects.

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Sunday could be the final performance on the track this year for the dazzling triple world and Olympic champion Bolt, who withdrew this week from a meeting in South Korea because of his "not-good physical condition".

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