Running very long distances can make your brain shrink

As athletic achievements go, running a marathon is towards the top of the list. But even this isn’t challenging enough for ultra-marathoners, who run races longer than the standard 42.2. kilometers (26 miles). The 2009 Trans Europe Foot Race, for instance, involved running from Italy to Norway—4,500 kilometers over 64 days. Such extreme feats are a good […]