Have you ever seen a runner late (or even early!!) in a race; slouched over and looking exhausted? Do you think that is helping them to run better? I'm sure you don't, and you would be right! Strong runners need a strong back!
But why? Well, let’s break it down.
To avoid the dreaded slouch:.
In order to maintain a good, upright posture, runners need to work on strengthening their backs. Staying upright is more comfortable and efficient than curving over whilst running. And your race-day pics look better.
To stabilise the hips:
We all know that most injuries come from the hips. A strong back keeps the hip stable, which in turn reduces your risk of injury. And nobody wants to be injured!!
The arms (and back) lead the legs;
As your legs fatigue, it pays to swing your arms faster. This will enable the legs to turn over faster. You can only do this if you have a good upright posture that is created by having a strong back.
You can breathe better: 
A strong back keeps you upright and enables you to open up your chest to breathe easier.
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In order to maintain a good, upright posture,Runners need to work on strengthening their backs. Staying upright is more comfortable and efficient than curving over whilst running. And your race-day pics look better!