You can't 'tone' muscle, so here's what is really happening when you build muscle definition, and why you need to know about ...

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. The word “toning” is ...

You're relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it's a muscle in your arm, your leg, or ...

The single most important concept is that “Athletic” and “Muscular” aren’t the same thing. As fitness culture became mainstream (through Instagram, CrossFit, and gym culture), the two terms started to ...

Modern fitness approaches go beyond aesthetics, emphasizing holistic health benefits. By understanding various training methods, individuals can design routines that align with personal goals, whether ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Previous note: [THIS FEELS LIKE A MUCH MORE ADVANCED QUESTION TBH -- I THINK WE CAN LEAN INTO THAT!

Let’s get one thing straight: Muscle is muscle. Despite what many fitness influencers may have you believe, there’s no such thing as "lean muscle" or "bulk muscle." It’s all made from the same stuff.

Infectious agents can cause muscle twitching and spasms, too. The most commonly known is probably tetanus, which causes a phenomenon called lockjaw, where the neck and jaw muscles contract to the ...