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 ...

The purpose of high-intensity interval training (HIIT) is to challenge the body by frequently changing the intensity of the exercise and the type of movement you are doing. For example, adding a set ...

As women enter their 40s and beyond, hormonal changes can make it harder to build muscle, maintain energy, and manage body composition. High-intensity training is one of the most powerful tools for ...

High-intensity interval training involves performing an all-out, exhaustive physical effort for a short time followed by a short (sometimes active) recovery. Its benefits are clear: Effective HIIT ...

According to new research, more than one in five Brits are running one to three times per week, while on TikTok, there are now 292.9 million running posts. There are many good things to come from the ...

As HIIT's popularity soars, sprint interval training, or SIT, is doing its best to catch up. Can shorter, harder, faster deliver better results? As the popularity of HIIT continues to soar, sprint ...

As runners, we’re always looking for ways to get faster and chase that elusive PR—and incorporating interval training into our regular routines definitely helps. But new research shows that interval ...

Whether you want to go all-out on a sprint or conquer some hills, this workout has it all—and you can do it in 30 minutes. But even if the weather is ideal, the treadmill can help you hone in on ...

Interval running condenses the powerful effects of regular running into shorter, high-intensity bursts. Research shows it can improve cardiovascular health, regulate blood sugar, and reduce body fat ...

Christopher Gaffney receives funding from UKRI, NIHR, North West Cancer Research, and the Ministry of Defence. But around 31% of us aren’t regularly doing enough physical activity – including going ...

Sprint interval training, or SIT, is super trendy right now. It’s a great way to improve your running speed and to get in a hard interval workout, and I’ll explain exactly how. But I also need to ...