Cardio exercise equipment, such as stationary bikes, treadmills, and elliptical machines, varies widely in price. You can get a cheap treadmill for $150, or a used bike for less.
Some of the top cardio exercise equipment the Bowflex Treadclimber ,Nordic track, Cybex exercise bicycles, Life Fitness equipment and the Pacenmaster Treadmills.
I prefer a bowflex. They are fun, easy, and you see results right away. U can set it up anywhere, outside is where i have mine. Its the only workout i ve done in years, i have no need to think about...
Most popular cardio exercise equipment would have to be the elliptical trainer. This set is used by over a 1,000 people around the US and it actually works if you stay dedicated to your challenge.