The Cardio Zone Everyone Ignores If you've been following me, fitness or longevity experts over the last few years, you've probably heard plenty about Zone 2 cardio. It's often praised for improving heart health, increasing endurance, and helping your body become more efficient at using oxygen. Those benefits are real, and Zone 2 has earned its place in a well-rounded fitness program. What doesn't get talked about nearly as often is that Zone 2 is still exercise. It places a