High-tech shoes and track spark fast times

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insisting that it is their training and dedication, not their carbon-plated, thick-soled shoes, that are the key factors in a series of amazing records.

But if you put a trampoline in, I think it's b******t, and I think it takes credibility away from our sport."

the changes make historical comparisons, and the appreciation of records, pointless,

The designer of the Olympic Stadium track in Tokyo revealed the magic ingredient squeezed under a thinner than normal 1.4cm surface was rubber granules that help create small pockets of air. "They not only provide shock absorption but give some energy return, at the same time a trampoline effect....maybe a 1-2 per cent advantage."

For qns on impact of technology on sport....