Whether you love cardio-driven workouts or avoid them like the plague, there's no denying that maintaining a strong cardiovascular system is essential for overall fitness and longevity. VO2 max is the ...

High-intensity interval training (otherwise known as HIIT) may sound, well, intense. And it can be. But it can also be highly beneficial, including for women over 50. The training modality has other ...

Most solid training plans include a weekly speed workout, often in the form of intervals. But the length of those intervals usually depends on your race distance, training goals, and fitness level.

Walking is a simple yet effective exercise which is suitable for all age groups and fitness levels. Over the years, various walking methods have emerged beyond normal walking and brisk walking. Each ...

Cycling outdoors in bitterly cold winds and snow, sleet, or hail isn’t everyone’s cup of tea. Factor in late sunrises and early sunsets, and riding outdoors during the winter months is off the table ...

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. Sprint interval ...

Army Reserve Spc. Julian Ditona, assigned to the 98th Expeditionary Signal Battalion, 335th Signal Command (Theater), sprints to the finish line of a 2-mile run during the Army Physical Fitness Test ...

There comes a time in every runner’s life when it’s time to kick things up a notch. That means one thing and one thing only: interval training. There’s a reason loads of runners don’t like intervals.