<p>Moments after Pheidippiddes ran the 26 miles from Marathon to Athens bringing word of the Greek victory over Persia, his heart exploded. Or, in Browning's words: "Like wine through clay,/ Joy in his blood bursting his heart."</p> <p>If there's a lesson in there, I'm not getting it.</p> <p>Up until now I have only run two half-marathons (leisurely spaced over two years), but even if my heart bursts at the 14km mark, all the money raised goes to a great cause - keeping animals far away from circuses and run-down zoos.</p> <p>*** Donating through JustGiving is simple, fast and totally secure. Your details are safe with JustGiving &ndash; they&rsquo;ll never sell them on or send unwanted emails. Once you donate, they&rsquo;ll send your money directly to the charity and make sure Gift Aid is reclaimed on every eligible donation by a UK taxpayer.</p>