Have you ever worked out and watched your muscles grow before your very eyes? You probably have, and while this is a fun, satisfying sight, it doesn't last. What you experienced is known as a muscle ...

The sensation of a "pump" or muscle congestion during workouts is a phenomenon that many fitness enthusiasts chase with zeal. That temporary swelling, that feeling of full and defined muscles, is not ...

Get ready for the ultimate pump.

Add Yahoo as a preferred source to see more of our stories on Google. Luis Alvarez/Getty Images Have you ever worked out and watched your muscles grow before your very eyes? You probably have, and ...