David Abbott only started running seven years ago, aged 35, but within a year he had qualified for the Boston Marathon and he's gone on to complete several sub-three hour marathons.
The American, who now lives in Japan, has also become a coach - not least through the prism of Twitter where under the moniker Mr Slow Easy Comfortable (search for @runliftrunlift) he offers reams of advice on everything from how running slower makes you faster, the benefits of weight training and what to do if you're a new runner.
Running Tales also spoke to David about how he grew his Twitter following and running in Japan...
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