Honestly, I think the best type of cardio is the one that you enjoy and will actually do! However, I would like to make a personal observation. I used to be partial to the elliptical, because according to the calorie-counter on the machine, I was burning A LOT of calories. I did that for years, but of course it got boring and monotonous. I’ve tried running several times. However, last Spring I ended up getting bronchitis due to breathing in the pollen… so I stopped. This year, I tried it again… this time I sprained my ankle (that was a few weeks AFTER my embarrassing face-plant after tripping over the curb… who knew that was there???). Although I enjoy running (mostly because it’s outdoors), it doesn’t seem to be the cardio of choice for me. After I sprained my ankle, I couldn’t do anything upright because it hurt my ankle too much. So, I bought a spin bike. I LOVE THE SPIN BIKE!!! I’ve been doing that consistently now for a couple of months, and I’ve actually noticed a difference in the shape of my legs. I have always depended on my weight training sessions for my body sculpting goals, and my legs have never taken the shape that I would like. Now that I’m doing the spin bike nearly every day, I’m actually getting the definition and curves in my legs that I’ve been wanting. At least to me they don’t look as “tree-trunk”ish as they did before. Even my husband can tell a difference. So, for me I’m hooked on spinning.
However, I still say that the best cardio for you is whatever you actually enjoy the most and will do consistently. I also think it’s a great idea to do several different types of cardio, because this will confuse your muscles and speed up your metabolism. It will also prevent boredom. All of these things will help you stay motivated and consistent in your exercise program.