PARIS — Earlier this week at Stade de France, those watching the first round of the men’s 110m hurdles were treated to a bizarre spectacle: American Freddie Crittenden appeared to jog through the hurdles, finishing more than five seconds behind the leader — an eternity in an event that typically takes just 13 seconds.

Fans may have thought it strange, but for Crittenden it was a strategic move made possible because of new rules outlining how athletes in individual sprint events can qualify for the semi finals.