The spanish study of top triathletes found those who cover more than 186 miles ( 300km ) a week on their bikes have less than4 % normal looking sperm .

西班牙科学家针对顶级的铁人三项运动员的研究发现，这些每周骑车距离累计超过186英里（300公里）的专业运动员，看上去正常的精子数量还不到4%。

Byrn now coaches other triathletes and says that " almost everybody has full-time jobs and I 'd say more than half have kids on top of it .

拜恩如今已经是一名铁人三项赛教练，他说：“来培训铁人三项赛的人几乎全都是有全职工作的人，我敢说其中至少有一半人还有孩子。