But what is zone 2 cardio, exactly? How can you make sure you're doing it right? And is it really so bad if your heart rate ...

This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. Zone 2 training is a type of cardio exercise where you use your heart rate as a guide to help you find the right intensity for ...

Yes, you can build muscle (and a lot of it) at the gym while still hitting the treadmill every once in a while. Here's how, ...

This post is part of Find Your Fit Tech, Lifehacker's fitness wearables buying guide. I'm asking the tough questions about whether wearables can really improve your health, how to find the right ...