I go to the ymca most every morning to work out. I alternate between swimming and doing the treadmill plus weights. While on the treadmill I only get up to 3.7 mph so its a walk for me. Even at that sedate pace I have often had near moments when watching HGTV and walking. I have often pictured myself falling on it and was pretty sure I didn't want to.
Yesterday I was hoofing along and to my right there was a yelp and the sound of a relative soft object hitting hard objects. One of my fellow treadmillers had gotten a little too involved in someone's remodel project and had mis stepped. He as actually running maybe 5 or 6 mph. He missed a step and that treadmill spit him off the back quicker than a country boy getting rid of a watermelon seed.
At first he jumped up quickly and said he was not hurt but very embarrassed, but after closer examination he found he had cut his finger. He went to the desk and in about ten minutes was back on the treadmill going as fast as ever.
I am still very sure I don't want to emulate him by falling!
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.