How it works, how to measure yours + tips for staying in the zone ...

For years, runners have used heart rate-based training to maximize their running potential. This method includes five “zones” at which your heart is beating at a percentage of its maximum capacity. In ...

Steady-state cardio has fitness influencers in a chokehold. But now some are questioning whether it’s actually the smartest ...

Even on training plans built for those with the loftiest of speed goals, you’ll notice that easy runs make up the bulk of the workouts. No matter the distance, clocking your fastest time requires a ...

Training for a specific goal race is a great way for runners to maintain focus and build fitness. As you complete race-specific workouts, your body becomes stronger and you get closer to achieving ...

Slow running has been emerging as an unexpected way to run faster over long distances. Easy, conversational-pace runs can help you build up your aerobic base and improve your endurance without burning ...

If you're a lifelong powerlifter or bodybuilder, there's a good chance you're more concerned about growing your glutes, carving your core, or building your biceps than boosting your VO2 max. But for ...

Few would disagree that cardio, also called aerobic exercise, is good for your health. Of the 10 most common chronic diseases, seven are "favorably influenced by regular physical activity," according ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? When I first started running seriously, I thought I had to be out of breath ...

We all need a "Zone 2" day -- a low-impact, low-intensity workout -- once in a while. This is especially true for those who find it hard to skip workouts and often push themselves to the extreme.