Twenty-six kilometres into this year’s London Marathon, I had to stop to be sick on the sidelines. I’ll spare the unpleasant details, but let’s just say it resulted in a very long (and tearful) ...

Chances are, unless it's a super-hot day or you're just about to deliver a speech in front of hundreds of VIPs, you don't think much about your sweat. It's an inconvenience at best, an embarrassment ...