The Boston Marathon does not qualify for world records because its course does not meet the official standards set by World Athletics for record eligibility. Here’s why:
Point-to-Point Course – The Boston Marathon is a point-to-point race, meaning the start and finish are far apart. World Athletics requires marathon courses to have a maximum separation of 50% of the race distance between start and finish. Boston’s course exceeds this limit.
Net Elevation Drop – The Boston Marathon has a net elevation drop of 448 feet (136 meters) from start to finish. World Athletics mandates that a marathon course must not have a net elevation loss greater than 1 meter per kilometer (which would be 42 meters for a marathon). Boston’s downhill profile exceeds this limit, making it ineligible for world records.
看了很多波马跑者戒告说刚开始的三个迈大下坡一定不能跑快，否则it will destroy your glutes. 也的确很多人跑过伤心坡以后发觉后面的六个迈相对平缓但是glutes酸痛跑不出来成绩了。
看到猫哥猫嫂的下坡马，一路坡度长度都比波马的前面几个迈厉害很多，反而很多人去跑这个白山马目标就是BQ，也的确很多人大幅PR，BQ了。之前尤其开心跑的马应该也是这个思路。
这样看起来就有些矛盾了。
跑过两个的人说说看，波马的有三五个迈不能快跑，后面三五个迈跑不快，是因为中间的起起伏伏吗？我记得猛子哥是说还是可以跑快一些的。
前面下坡跑太快，后面上坡和最后10K就会失去后劲。
任何比赛都要有控制，哪怕是总体5000英尺一路的大下坡，比如Mt Charleston。。
跑大下坡对双腿保持力量控制的要求高。特别是股四头肌quadriceps 需要控制膝盖和落脚，减少重力对这些部位的冲击, 你试试跑个大下坡就会感觉到quads肌肉高度紧张，一点也不轻松。但是总体下坡马还是很有优势的，因为重力站在我们这边，速度自然会快。
练下坡马要多练quads的力量。重力训练eccentric loading会有帮助。
但是不是说就很慢，肯定是比目标配速快一点，但是不能快的很离谱，否则后面都是加倍还回来
我爬山爬得最辛苦的一次就是第一天大下坡，第二天再爬上来。第一天下坡腿就搞残了。这个坡也陡一些，大概坡度超过100%（角度45度）了。
The Boston Marathon does not qualify for world records because its course does not meet the official standards set by World Athletics for record eligibility. Here’s why:
Point-to-Point Course – The Boston Marathon is a point-to-point race, meaning the start and finish are far apart. World Athletics requires marathon courses to have a maximum separation of 50% of the race distance between start and finish. Boston’s course exceeds this limit.
Net Elevation Drop – The Boston Marathon has a net elevation drop of 448 feet (136 meters) from start to finish. World Athletics mandates that a marathon course must not have a net elevation loss greater than 1 meter per kilometer (which would be 42 meters for a marathon). Boston’s downhill profile exceeds this limit, making it ineligible for world records.