The new marathon shoes changed tactics before they changed times

Less late-race damage means the decisive move now comes earlier, and the old grind-them-down plan no longer works.

Everyone argued about the records. Almost nobody noticed that the races themselves started being run differently, which to me is the larger change.

The old marathon plan was attrition. You held a pace that hurt, waited for the field to fray somewhere after thirty kilometres, and won because your legs were less destroyed than everyone else's. That worked because the damage was cumulative and largely mechanical. Thousands of impacts, each one loading muscle that is lengthening under load, adding up to the shuffle everyone recognises in the closing miles.

Reduce that damage and you remove the mechanism the plan depended on. If half the field arrives at thirty-five kilometres with legs that still function, waiting no longer thins anyone out. The move has to be made, and made hard, and often earlier than a coach would once have dared, which is why so many recent races have looked like a long surge rather than a slow bleed.

There is a second-order effect on who wins. When the closing stages became less about surviving damage and more about producing speed, the event tilted toward runners with track credentials, people comfortable changing pace at will. The pure grinder, the athlete whose whole edge was durability, lost part of their advantage without getting slower.

I do not think this is a scandal, and the fairness argument is largely settled by everyone having access. What bothers me is quieter. The sport's history is now split into two files that cannot be compared, and we keep pretending otherwise by printing one list. A performance from the previous era gets read as inferior by anyone who was not there, which is a slow, unfair erasure of a lot of very hard running.

Federations could fix this trivially with an annotation. They will not, because a record book with an asterisk in it looks like an admission.

The other thing nobody says: this has made the sport harder to coach, not easier. If the field no longer breaks on its own, someone has to break it, and that requires a nerve that no shoe supplies.