Today I set out after a week recovering from last week's calf strain. It was all going so well and at the 4 minute mark everything was going great. Then without any warning I there was what felt like a light tap to the back of my leg, low in the calf and high in the Achilles. I stopped immediately and pulled the plug on the run. The last thing I wanted was a ruptured Achilles tendon. The rest of the day has been pain free so it's another wait and recovery before next run.