Track federation vows to fight for new rule barring female athletes with naturally high testosterone
The IAAF wants athletes with hyperandrogenism — such as two-time Olympic gold medalist Caster Semenya — to take medication that would alter their body chemistry.
Reaching the finish line is never guaranteed in ultra running, a supercharged version of the marathon in which athletes attempt far-longer distances in often harsh conditions. One popular ultra race begins in the searing heat of Death Valley and finishes 8,300 feet up Mt. Whitney.