Muscle growth is influenced by several key factors. Here are the top five that directly affect how quickly you can build muscle. Giselle Castro-Sloboda Fitness and Nutrition Writer I'm a Fitness ...

Spinal muscular atrophy (SMA) is a disorder affecting the motor neurons—nerve cells that control voluntary muscle movement. These cells are located in the spinal cord. Because the muscles cannot ...

Even if you go to the gym every day, you won't automatically get healthy muscles. In addition to a balanced regimen of exercise and strength training, you need a good diet to help you build and ...

Scientists studying the infamous 3-body problem have discovered certain "islands of regularity" that emerge from the gravitational chaos. When you purchase through links on our site, we may earn ...

What Is the Psoas Muscle? The psoas (pronounced so-ezz) muscles are two large muscles in your lower back. You have one on either side of your spine. They're the main muscular connection between ...

Muscle growth, or hypertrophy, is an increase in the weight of a muscle with no change in the number of fibers present. Depending on your physical needs and goals, you may be interested in taking ...

The first law of strength training is simple: Lift weights, and your muscles get bigger. That’s the fundamental bargain that gets people through the doors of the gym, and it’s true – up to a ...

The iliopsoas muscle is the major flexor of your hip joint. It’s made up of three muscles: the iliacus, the psoas major, and the psoas minor. These muscles work together to flex your hip, as well as ...

Teachers aren't the only ones who carefully follow grading systems. Physical therapists use a muscle strength grading system to define how a muscle or group of muscles is performing. PTs commonly use ...

IF YOU'VE EVER pushed through a grueling workout, you're likely no stranger to muscle soreness. It's that delightful sensation that reminds you of your hard-earned gains and has you wondering why ...