Triathlon is hot. In the past five years, participation in the sport of swimming-biking-running has tripled in the UK. It's estimated that nearly 100,000 people in this country will race the triple this year. Who are all these multi-taskers, and why

Whether you’re lacing up your trainers for the first time since school, or are about to tackle your umpteenth ultra, chances are you’ll have questions about running. Are you doing things right? How you can improve? Is what your mate said

- except that you type out your conversations and you never know who's going to chip in next. As well as being an exceptional place to spend a social hour or two, they're where you can tap the collective knowledge of over 140,000 runners, from first

picking up the pace and eventually the walking breaks went. A few years on, I'm now a marathon runner and gone from a size 14 to between an 8 and a 10. So stick at it, it's worth it in the end. Oh, and by the way,you'll burn a lot more calories outside

:48 and on that day I passed through the half at 1:47 and 25km at 2:09, which was also a PB. I think it works better for longer distances - I've done sub four minutes for 1K and 23 mins for 5K but never dipped under 48 for 10K. I can run fast for short distances