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You might be able to run through a tight hamstring or a sore quad, but an injured foot or ankle usually puts the brakes on a session – and can ruin your entire training season. Our feet and ankles, after all, are the foundation of our sport. When they are working well, they allow us to love every step, so it’s a priority for all runners to keep them healthy.

Feet and ankles are built tough, capable of sustaining two or three times our bodyweight. But when they are abused (overworked, overtrained) or neglected (understretched, understrengthened), they’ll complain. And the result could be one of the two most chronic, hard-to-heal injuries a runner can face – namely, plantar fasciitis or Achilles tendinitis. To avoid the dreaded ‘itises’ it helps to first have an appreciation for the role your feet and ankles play in your running.

I've definately been there - More sound advice off runners world click link to see full article

http://www.runnersworld.co.uk/beating-injury/injury-proof-your-body-feet-and-ankles-preview/2974.html