An **exercise bike** is a stationary fitness device designed to simulate the experience of cycling within an indoor environment. It typically features a saddle, pedals, and handlebars, utilizing a weighted flywheel and adjustable resistance levels to provide a customizable cardiovascular workout. These machines are highly regarded for offering a **low-impact** form of aerobic exercise, which minimizes stress on the joints while effectively strengthening the lower body—specifically the quads, hamstrings, and calves. Modern versions often include digital consoles to track metrics such as heart rate, distance, and calories burned, making them a versatile staple for both home gyms and commercial fitness centers.