Can I use the Nike+iPod Sport Kit on a treadmill?
People report mixed results when using the Nike+iPod Sport Kit on a treadmill. Personally, I found it to be much less accurate than on solid ground. The difference between the treadmill mileage reading and the Sport Kit mileage was over 10%, which I don’t find to be very useful. One reason may be the difference in mechanics; On a treadmill, both feet are always moving – the one on the belt backward, and the one in the air forward – while your body remains stationary. When running on the ground, one foot remains stationary while your whole body moves forward.