These carbon-plated wonders have broken every record in the books—but they might not be the best for you. Here's why.

We tested popular treadmills to help you find the best model, whether you're on a budget or ready to splurge. Plus, we explain what to know before you shop.

Fact checked by Nick Blackmer Zone 2 cardio is moderate-intensity exercise—like brisk walking or cycling—done at about 60% to 70% of your max heart rate.It helps your body burn fat more efficiently, ...