Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...

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Core muscles wrap around the midsection like a girdle, forming a connecting link between the upper and lower body. They support, stabilize, and help move your spine, trunk, and pelvis, and most body ...

The sit-up has been a staple exercise for as long as most people can remember, from health clubs to military physical fitness tests. But many experts say it can lead to back injuries. Photo: Getty For ...

As you go about your business in the weight room, have you ever glanced over at a personal trainer during one of their client sessions and idly asked yourself something like, Dang, I wonder if they ...

The sit-up may seem basic—but you can get a lot more toning out of the same old ones you’ve been doing for years. Nate Bower, Toronto-based personal trainer and YouTube fitness coach, is here to guide ...

Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II. We've moved on to bent-knee sit-ups, to crunches and now to the plank pose or hanging ...

Carve out some extra time on your mat, because you’ll need to do both. Cote says sit-ups—and similar exercises such as crunches, leg raises, and reverse crunches—work your rectus abdominis, or the ...

Think you can stomach the FBI’s sit-up test? The FBI accepts applications from people between 23 and 37 — though veterans may qualify for an age waiver. Besides a background check, applicants must ...