If you prefer to run on a treadmill or use an elliptical machine
for training, you may feel nauseous when you stop using the machine
. This is likely due to the perpetual motion of the treadmill belt. When your body is sustaining a constant motion, such as running, and you attempt to participate in other activities, like watching television or reading magazines, your eyes have trouble focusing. This leads to a sensation akin to feeling sick after being in the car for too long.