These replace the upright bicycle seat with a wide seat and full seat back, and place the pedals in front of the user instead of underneath him or her. This is known as a "step through" design, giving the bike a low profile that is easy to access. Users with hip, knee, foot and back issues usually find that recumbent bikes give them an effective aerobic workout without causing extra pain. Others just find them more comfortable than traditional upright exercise bikes.Upright Exercise Bikes
This type of stationary bike is made to look more like a regular, outdoor bike. They also mimic the riding position of a standard bicycle, with a saddle seat situated above the pedals. Upright indoor exercise bikes are powered by a motor, with programs that simulate different types of terrain or that aim to achieve specific fitness, weight loss or performance goals. One advantage of classic upright exercise bicycles is that their seats tend to be more ample and better padded than those of indoor exercise bikes used in group classes.Indoor Exercise Bikes
Made popular by the proprietary Spin® brand of bikes that are used in Spinning® classes, these types of bikes use a weighted flywheel for a more intense session and they also feature reinforced construction. That allows users to stand and lean forward safely, just as they would if they were in a bicycle race or climbing a steep hill. Adding one of these bikes to your home gym enables you to have a stationary bike that more closely replicates the act of using a traditional bicycle -- and can save you money over the long term on gym and class fees.