If your VO2 max won't improve, you might be missing a key piece of the training equation.

Balanced approach: Pairing Zone 2 cardio with high-intensity intervals delivers both endurance capacity and peak performance gains. Why it works: Lower-intensity work develops the aerobic system, ...

High-intensity interval training is a workout technique that gets you a lot of bang for your buck. This type of workout serves as cardio and strength training, burning calories, boosting your ...

Interval training is great for boosting cardiovascular endurance and promoting overall fitness. Our fitness expert, Judd NeSmith, NASM-CPT, PES and founder of Serious Fitness, explains interval ...

High-intensity interval training, or HIIT, is a great way to torch calories, boost your metabolism and get a great workout in a shorter amount of time. And if you're a fan of hopping on the treadmill ...

Row, row, row your… way to absolutely massive cardio gains. Here's why the experts think jumping on the rower can give you an ...