I'm running 5.3 mph at 0% incline with a heel-toe stride. After about 80 seconds, my left shin was flaring up again. I thought my breathing would be the big limitation. Instead, I have an uncoorperative left leg. Based on counting several times, I estimate 76 strides per minute, where according to Chi Running it should be 85 to 90.
Here, I am landing on the balls of my feet. I speed it up to 5.3 mph, then 6.5, and then 7.6. My shins don't bother me. After I get her slowed down to 3.3 I elect to ride off the end. It didn't go as gracefully as planned and I am glad the basement is carpeted.