WASHINGTON — Hospitals in about a dozen states are testing whether some simple steps, such as arm-strengthening exercises, could reduce the risk of one of breast cancer's troubling legacies — the ...

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.

SARS-CoV-2 is the virus responsible for COVID-19. People may report a wide range of symptoms, which continues to grow as experts learn more about the illness. While viral infections can cause joint ...