Some of the top cardio exercise equipment the Bowflex Treadclimber ,Nordic track, Cybex exercise bicycles, Life Fitness equipment and the Pacenmaster Treadmills.
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.
Skipping, the most effective exercise of all next come running ( jogging), cycling.most important factor is breathe as much as possible when you do a exercise.
A very good way to get abs is too do crunches but since there not actual equipment the best equipment I could suggest would be a bicycle pump, they are proven to work very effectively.