"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." TO MAKE THE arm muscle gains you want, you'll need to be intentional. Following a balanced workout split ...

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 Solutions for Back ...

Plus, how to get the most of your walking workout.

The more we move, the more our muscle cells begin to make a memory of that exercise. MIT Technology Review Explains: Let our writers untangle the complex, messy world of technology to help you ...