This discovery changes the way scientists think about aging. It suggests that part of what we call age-related weakness may actually be a communication problem between the brain and the muscles. As ...

Building muscles: Muscle stem cells (their nuclei marked in blue) gradually alter their structure and function, becoming adult muscle cells (whose nuclei turn red). Those cells will eventually fuse ...

These strength and transition drills helped PT Meghan Callaway learn one of the toughest bodyweight moves ...