These shoes are crazy and will continue to reduce times. But you have to remember that this year the weather was excellent for marathon running in both Berlin

These shoes are crazy and will continue to reduce times. But you have to remember that this year the weather was excellent for marathon running in both Berlin (women’s WR) and Chicago (men’s WR, would have been women’s as well if not for Berlin). That isn’t always the case, so it can be hard to know what the actual rate of “improvement” is. Remember that the staged 1:59 run in Vienna (didn’t count for anything) was back in 2019.