Originally posted by Madd Marine
iaaf have limits on how energy-efficient tracks are ( no more than 65% efficiency ) & these rules have been in place for a long time ( certainly before '91 when tokyo was found to be illegal track )
we've seen some surprising performances on perceived "slow" tracks in past few years
- mj running 19.85 on a wet, cold day in edinburgh
- safa running 9.77wr in gateshead
- kennster running 7'26 off far from ideal pacing in sheffield
it's possible pacing & environmental conditions at the time are more important than any track conditions
for distance runners these new tracks may provide more benefit after the race than during it - geb's feet were smashed up after '96 10k & coudn't run 5k - it's possible these tracks now woud have offered protection for his feet & allowed him to run the 5k after, rather than any huge speed improvement
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