In her book, “On Muscle: The Stuff That Moves Us and Why it Matters," journalist and author Bonnie Tsui explores the biology and beauty of muscles. (Drawing by Bonnie Tsui) For a long time, ...

When you train your muscles (either by lifting weights, running, or doing resistance work), you create tiny microtears in your muscle fibers. While this might sound detrimental, it’s actually a good ...

Developing bigger pectoral muscles, or "pecs," is one of the most common goals for anyone focused on building upper-body strength or improving their physique. After all, a strong, well-developed chest ...

Creatine might be famous in the gym, but its real story is far more interesting. Naturally produced in the body, it helps power cells by rapidly regenerating ATP—the fuel that keeps muscles, the brain ...

Muscle loss, or atrophy, due to inactivity is common after illness, injury, hospitalization or falls, and becomes increasingly frequent with aging. New research published in Advanced Science shows ...

Heart & Circulation Both very low and very high heart rates may be linked to higher stroke risk, study says ...

When you’ve pushed through an intense workout, you might have sore muscles to go along with that surge of accomplishment. Maybe it’s those quads and hammies after leg day or triceps and biceps after ...

Strength training doesn’t have to be complicated. Fitness content on social media may leave you thinking that you should only work out at specific times, use certain weights and incorporate an ...

Building muscle after 50 is essential for feeling strong and healthy. While you’re perfecting your strength training routine and making sure to eat enough protein, you might wonder: How long does it ...

Still dealing with a tight hip or weak glute—despite all the foam rolling, stretching, and strengthening? Or, maybe you’ve had an injury that keeps flaring up, even though you thought it was finally ...

Workout regimens often flame out as quickly as it takes them to start trending. But others can stand the test of time. Exercises like tai chi, running, swimming, hiking and yoga have been around for ...