Cardio is a type of exercise that's important to get your heart pumping and even get your energy levels up. Whether you're ...

Do you even know what HIIT stands for? We have the answer to that—and more.

Hint: You can’t really go wrong—but your goals can point you one way.

Does avoiding cardio kill muscle mass? Here's what one exercise scientist says.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. So where should you ...

I discovered spin classes a decade ago, and subsequently got certified to teach them myself. In the years since, I haven't focused on other kinds of cardio group classes—but for a time, I was obsessed ...

VO₂ max may sound like something out of chemistry class, but it's actually an important component of living a long, healthy ...

Learn how low-impact cardio can reduce stress and build muscle, as one longtime fitness expert highlighted its significant benefits. Low-impact cardio offers multiple benefits, including improved mood ...

This workout is designed to test your ability to transition seamlessly between heavy tactical strength and high-heart-rate ...

Group fitness is changing. What was once largely focused on weight loss and high-cardio exercise for an aggressive calorie burn has evolved to reflect the present-day gym mentality, with a greater ...