I found some interesting data relating to gravity in the venues of 100m races & the best of Usain Bolt's performances.<p>Berlin g 9.8128 T 9.58s
Beijing g 9.8011 T 9.69s
Rio g 9.7880 T 9.81s<p>Gravity taken from http://www.ptb.de/cartoweb3/SISproject.php<p>Track Times from https://en.wikipedia.org/wiki/Usain_Bolt<p>Feel free to dig in more with different athletes.
I think HN would find this intriguing.Perhaps if you created a blog post about this and wrote some conclusions there'd be more of a story to this idea.