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 ...

Over the years, you've perfected your gym routine. You hit your pecs, lats, bi's, and tri's on a consistent basis. But is this to your downfall? Sure, these mirror muscles garner attention on the ...

Imagine you’ve just completed a tough upper-body workout. Your muscles feel a bit tired, but all in all, you’re able to go about the rest of your day just fine. The next morning, you wake up and ...