What is the best equipment for cardio?
Anything that utilizes arms and legs simultaneously will burn significantly more calories than anything else. My personal favorites are the Giant Dual Fit bicycle, Schwinn Air Dyne bicycle, or the Versa Climber. All of these machines have zero impact and use your entire body to burn fat and strengthen muscle at the same time. If I had to pick one, the Giant Dual Fit bicycle is the hands down winner; it only costs a few hundred dollars, it never needs maintenance, it never breaks down, it leaves no messy oil or dust and only takes up a small amount of space.