http://www.xzbaodeng.com/News/manual-versus-electric-choosing-the-right-treadmill/ Treadmills in general can be divided into two categories, manual and electric. Electric treadmills may be more expensive but they have several advantages. They allow you to control your exercise with greater accuracy. Treadmills in general may vary in size, make, and features, but the principles are the same for . Fri, 18 Dec 2009 19:09:52 EST en