The American College of Sports Medicine recently released new resistance training guidelines—its first update in 17 years.

Skeletal muscle is the type of muscle that controls movement. Problems with these muscles can be minor, life-threatening, or ongoing problems that make it hard to perform basic daily activities.

Most fitness-minded people have probably heard of fast- and slow-twitch muscle fibers. However, the distinction can be somewhat mysterious, especially in the context of understanding how it relates to ...

Tokyo, Japan – Researchers from Tokyo Metropolitan University have discovered that a protein excreted by type I (slow) muscle fibers, key to muscle endurance, can cause surrounding myoblasts, ...

It's well known that spaceflight causes muscle atrophy and other biological changes in reduced gravity, and especially in ...

Looking to build muscle but feeling overwhelmed by conflicting advice? We got two top trainers to break down exactly how to structure your weekly workouts for maximum gains. Whether you’re a gym ...

Researchers find that a gut bacterium may influence muscle strength and fitness, opening the door to probiotics that support ...

Delayed Onset Muscle Soreness (DOMS) is a well-studied but still somewhat misunderstood phenomenon in exercise science. It ...

Muscle knots are highly irritated muscle fibers that have tightened into a ball in one area of your muscle. These painful, tender spots can feel sore and often occur in your upper back, shoulders, or ...