Treadmills and elliptical trainers are two of the most popular pieces of exercise equipment and are excellent tools for getting an aerobic workout indoors. When you compare treadmills vs. elliptical trainers, you will quickly realize that elipticals have only come to the party fairly recently, whereas treadmills have been around much longer. Consequently, treadmills are more well-known and more commonplace. However, before you go and buy that treadmill, you may want to give elliptical trainers a second glance.