Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Proprioceptive neuromuscular facilitation (PNF) is a form of assisted stretching. It combines passive stretching with muscle contraction. First, your partner applies force to stretch your muscle ...

Editor’s note: Dana Santas, known as the “Mobility Maker,” is a certified strength and conditioning specialist and mind-body coach in professional sports, and is the author of the book “Practical ...

Achieving strong, defined arms or legs is about more than just lifting weights. A ton goes into growing your muscles—and that includes proper nutrition, recovery, and working out in a specific way.

There is perhaps no better way to see the absolute pinnacle of human athletic abilities than by watching the Olympics. But at the Olympics – and at almost all professional sporting events – you rarely ...

You’ve probably heard the phrase “engage your core” at least once in your life, even if you’ve never seen an exercise program, read a fitness magazine, or set foot in a gym. Sometimes it’s gently ...

Regular activity not only strengthens muscles but can bolster our bones, blood vessels, and immune system. MIT engineers have now found that exercise can also have benefits at the level of individual ...

Electrical muscle stimulation involves sending electrical impulses through the skin. This stimulation may provide benefits, such as helping repair tissue and strengthening the muscles. Share on ...

There is perhaps no better way to see the absolute pinnacle of human athletic abilities than by watching the Olympics. But at the Winter Games this year — and at almost all professional sporting ...

Vaginismus makes vaginal penetration painful or impossible due to pelvic floor muscles involuntarily contracting. Primary vaginismus is lifelong, while secondary vaginismus develops after previously ...