The run/walk method has been around since the 1970s, and it has surged in popularity as more athletes learn that regular walk intervals may help you run longer—and faster. Olympic marathoner and ...

If you’re looking for a way to boost your athletic performance, calorie burn, and fitness level, you may want to consider sprint interval training (SIT). Similar to high intensity interval training ...

Consider speed a goal that never goes out of style. Whether you have a (likely virtual) race on the calendar, or you’re just bored with your run routine and need a new challenge, intervals should have ...

For years now, I’ve had a default workout format that I rely on when I’m looking for a good hard effort that doesn’t feel that hard: the descending ladder. The details depend on how fit I am and what ...

If you're looking to torch stubborn belly fat, boost your cardio conditioning, and challenge your lower body—all while staying in one spot at the gym—the stair climber is your secret weapon. With ...

High intensity interval training (HIIT) is only effective for improving fitness when performed at 60-second intervals, according to new research. High intensity interval training (HIIT) is only ...

A couple of years ago, I wrote an article about the fine-grained nuances of interval training. According to Paul Laursen and Martin Buchheit’s telephone book of a text, Science and Application of High ...

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 ...