VO2 max is a buzzy measure of heart health and fitness. I tried a class that promised to boost my VO2 max through cardio and breathwork. I don't typically do cardio, and I realized taking classes ...

Plenty of research touts the importance of cardiorespiratory fitness (CRF)—also known as cardio fitness, cardiovascular endurance, and aerobic fitness—as a health marker, as well as an athletic ...

When you think about how fit you are, you might think about how far you can run or how many push-ups you can do. Or maybe you think about health metrics like your resting heart rate or heart rate ...

This is read by an automated voice. Please report any issues or inconsistencies here. If your smartwatch has ever flashed a “VO₂ max” score or you’ve heard ...

Running while overweight is hard and can take a toll on a person’s feet, knees, shins, lower back and hips. Here is this week’s question: Stew, what is your advice for heavier athletes running for ...

A combination of cardio and strength training is crucial for heart health, muscle strength, and healthy aging.

Is soft cardio the missing piece of your workout routine? We spoke to a sports medicine physician and a pro trainer to find out.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. January 12, 2026 Add ...