High-intensity interval training, or HIIT, is a great way to get in a fast, effective workout. This quick routine is helpful ...

Sometimes in life, you really can't beat the old stuff. Old friends, old tunes, old movies - we love them all. And when it comes to working out, it seems we're partial to going retro too: indoor step ...

This group fitness class combines elements of strength, cardio, and dance to deliver a fun total-body workout. This remix-style video features all of your favorite instructors, including Raneir ...

Instructor Kaleila Jordan creates a fun, energetic atmosphere with a challenging lower-body workout. This class is a great choice if you're looking to engage your core, hips, and glutes. You'll move, ...

Looking for some home cardio workout videos you can do indoors from the comfort of your air conditioning? We’ve got you covered. From coast to coast, record high temps are sweeping the country this ...

I often get asked what the best workout is to do when you are trying to add fitness back into your life again. My answer always is: "The one that you will consistently do." Consistency matters more ...

Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...

If you are relatively new to fitness training and looking to work a full-body day into your week, consider the Push-Pull-Leg routine below. This series of circuits can be done in its entirety, or you ...