snipey, glad you clarified that. I was looking at those stats, and thinking to myself: this guy is doing a C25K training course, and throwing in a sub-6 minute paced 1/2 mile run in the middle of a 2-mile workout???? Something's gunna give, and it's gunna give in a big way.
A sub-6 face-plant is nothing to sneeze at. I've BTDT, stepped in a gopher hole while dodging some tourists who refused to move while "walking" as a group down a runner's pathway. The result, a severely twisted ankle, some skin loss on shoulders, elbows, and assorted other body parts, and a whole string of words those tourists never thought to hear on their trip to America. 
Be careful on that treadmill at those speeds, that surface can be very abrasive to human tissues not covered in shoe leather.
Heart Keeps Running When Strength Runs out. Got Heart?