Why is the women's 800m record so tough to break?
The world record for the women's 800m is the longest-standing in athletics. No-one has managed to break it for 43 years. So why, despite leaps forward in shoe technology and our understanding of nut… [+3780 chars]
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This story is credited to BBC News. Author: Emma Middleton - BBC Sport journalist. Some news APIs provide excerpts only. Full licensed republication depends on your API/content rights.