Cardio FAQ & Facts

Science-backed answers to help you train smarter, build endurance and get more from every workout.

Woman checking heart-rate zones on smartwatch during cardio training.

Movement vs. Cardio: What's the Difference

Most people mistake activity for cardio. Real cardio trains your heart—structured, measurable effort that builds endurance and strength. HupSix makes it simple and fun.

Movement vs. Cardio: What's the Difference

Most people mistake activity for cardio. Real cardio trains your heart—structured, measurable effort that builds endurance and strength. HupSix makes it simple and fun.

heart rate zones chart for cardio training

How to Calculate Heart Rate Zones

Heart rate zones show how hard your heart works—and how to make every minute count.

How to Calculate Heart Rate Zones

Heart rate zones show how hard your heart works—and how to make every minute count.

HupSix gear with person holding the app, showing Garmin heart rate zones and cardio tracking.

HupSix Garmin Test: More Cardio, Less Mileage

Your Garmin (Apple Watch, Polar, Whoop) might show less than a mile in 30 minutes of HupSix, but the heart rate zones tell the real story. 

HupSix Garmin Test: More Cardio, Less Mileage

Your Garmin (Apple Watch, Polar, Whoop) might show less than a mile in 30 minutes of HupSix, but the heart rate zones tell the real story. 

chest strap vs wrist fitness tracker heart rate accuracy chart

How Accurate Are Fitness Trackers?

Fitness trackers help with awareness, but steps and calories miss the point. What matters most is time spent in your moderate and vigorous heart-rate zones.

How Accurate Are Fitness Trackers?

Fitness trackers help with awareness, but steps and calories miss the point. What matters most is time spent in your moderate and vigorous heart-rate zones.

Does Cardio Kill Muscle Gains? (What the Science Actually Says)

Does Cardio Kill Muscle Gains? Myth vs. Science

Lifters often blame cardio for muscle loss. Science says otherwise. Here’s the truth about cardio, cortisol, and why your heart still needs training.

Does Cardio Kill Muscle Gains? Myth vs. Science

Lifters often blame cardio for muscle loss. Science says otherwise. Here’s the truth about cardio, cortisol, and why your heart still needs training.

Do You Need Cardio to Lose Weight?

Do You Need Cardio to Lose Weight?

You don’t need cardio to lose weight but it plays a major role in keeping weight off. Here’s what cardio really does, why recovery matters, and how fitness supports lasting...

Do You Need Cardio to Lose Weight?

You don’t need cardio to lose weight but it plays a major role in keeping weight off. Here’s what cardio really does, why recovery matters, and how fitness supports lasting...