My usual running routine is to to walk at 3.1 mph for 5 minutes, run at 5.4 mph for 40 minutes , and then cool down with a 5 minute walk at 3.1 mph. Sometimes I'll do the last minute of the run at 7.0 mph. Today I decided to move up to 5.5 mph and when I got to the last minute, I got to the last minute, I decided to see how fast I could go. I discovered that the treadmill will only go up to 7.9 mph. When I got it to that speed, it quit and displayed the "ER21". I wore out the machine. Look out Warrior Dash, I am coming for you.
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