Stationary bikes offer an excellent low-impact workout for the novice fitness fanatic, while also providing a "weatherproof" way for even a competitive triathlete to train effectively without hitting the road. Available in a variety of different models, ranging from recumbent bikes — which place the body in a seated or supine position while providing support to the lower back — to upright stationary bicycles which simulate the body's positioning on a typical road or mountain bike. These upright bikes are used in resistance-based spinning workouts. When shopping for a stationary bike, decide what features and preferences will help in ensuring you get the most out of your new fitness equipment. Popular options on both recumbent and upright stationary bicycles include specialized friction mechanisms, fans, fan wheels, bicycle ergometers, and dual-action motion to give the rider a total-body workout with increased arm motion and resistance.