I get the question, "What is the best cardio?" a lot. So I wanted to address it publicly. The best cardio, in my opinion, is anything that you will actually do. Sure there are arguments on whether the elliptical is better than the Treadmill, or the Stepmill is better than the stationary bike, but the reality is that you will reap the most benefits from any cardio that you do as long as you actually do it. So get out there and figure out which is the best for you.
For me, it's running outside — it happens to be my favorite way to work out and I know that doing something I like actually increases the likelihood I'll do it. So what is the best form of cardio for you?