Stationary bikes (or upright bikes) have been around for many years and are a piece of exercise equipment often found in homes. They can also become boring because you are constantly leaning and bouncing.
Dual Action Bikes
Dual action bikes have handles that move independently and are great for giving you both an upper and lower body workout. Some dual action bikes can be adjusted to create an arm pedaling workout which effectively gives you two exercise options. Dual action bikes can be difficult for beginners to use.