How they work There are two types of treadmills, motorized and manual. ... Manual treadmills do not have motors. They tend to have ... Health risks or cautions Mounting and dismounting the moving belt are the chief hazards of treadmill use.
|Title||:||The World Book Health and Medical Annual-2000|
|Author||:||World Book, Inc. Staff|
|Publisher||:||World Book - 1999-09|