It's the most shared article about running injuries this week. And it poses a simple question - why in an age of brightly colored running shoes complete with gels, foams, air pockets, and arch supports, do more than half of all runners get injured each year?

A good running week for...lovers of high-class sprinting. We'd all suspected it, but it's finally official - Usain Bolt is definitely available for selection at the Glasgow Commonwealth Games. The athlete has been struggling with a foot injury and he won't run the individual 100m. But the Jamaican has made himself available for relay events at the championships.

A good running week for...the underdog. It sounds like fiction, but it actually happened this week. Wilson Kipsang's training parter, Geoffrey Ronoh, took on the unglamorous role of pacemaker at the Olomouc half-marathon in the Czech Republic. But, remarkably, he was able to defeat Kipsang, in the process achieving a course record time of one hour 17 seconds.

A good running week...for Galen Ruup. The aura around coach Alberto Salazar and his cadre of top athletes continues to grow. This week one of Salazar's top athletes, Galen Ruup, won a record sixth national 10km title in a time of 28 minutes and 12 second, at the USA Outdoor Track and Field Championships.

A good running week for...pregnant runners. Alysia Montano competed in the 800m at the US Track and Field Championships this week. Not much news there - apart form the fact that she is due to give birth in under two months' time...

A bad running week for...Lawrence Herman, former assistant director of the Frederick Marathon in Maryland. He was sentenced to five months in prison, plus a period of home confinement.

The big question for anyone who cares about the health of youngsters - how much activity is really necessary to maintain health?

Surely this can't be true...an unbiased article on the potential role for barefoot running in injury prevention!

This article examines an overuse running injury that is dreaded by many runners - the stress fracture.

The latest weekly round-up of the top products and bargain deals available for runners - including the place where every piece of running kit is reduced by at least 50%.