Iowa Army National Guard soldiers participate in the sprint-drag-carry event during an Army Fitness Test at Camp Dodge Joint Maneuver Training Center in Johnston, Iowa, Sept. 12, 2025. (Sgt. Ruth ...

Hearing about a workout called a “fartlek” for the first time as a new runner might be intimidating and confusing. That’s because most terms, like “long run” and “speed workout,” are pretty ...

Whether you’re already strength training on a regular basis or have made a resolution to start, it’s a good idea to occasionally plan a sort of strength reset: Look at how often you’ve been lifting ...

Staff Sgt. Elyse Bailey, a U.S. Army Reserve military police soldier representing the 200th Military Police Command, recovers after running the 2-mile Army Combat Fitness Test during the 2020 U.S.

Hearing about a workout called a “fartlek” for the first time as a new runner might be intimidating and confusing. That’s because most terms, like “long run” and “speed workout,” are pretty ...

According to an NIH study, regular endurance training “prevents metabolic syndrome, regulates fat metabolism, decreases blood glucose levels, delays the onset of type 2 diabetes, and reduces the risk ...

VO2 max is your body’s ability to use oxygen when you increase your effort. The higher it is, the more you can maintain a fast pace before things start to fall apart. VO2 max is ...

Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

If you feel like all of your friends are suddenly training for major endurance competitions like half marathons, marathons, or even triathlons, you might feel a bit of FOMO from watching them rack up ...

Incline walking and running are commonly framed as opposites: one is low impact, the other is high-intensity. But in reality, they’re both effective cardio options that challenge your body in distinct ...

You’re out for a long run filled with rolling hills and you start to feel the burn in your leg muscles. It makes sense: You know your lower body is working hard to propel you through your miles. Yes, ...