Avoid injury and get the most out of your squats! Learn how to master proper form and technique with these expert-approved tips for the Smith machine.

That's right—we're talking about the torso rotation machine. This is the Chubby Checker–inspired ab machine you sit in to do ...

This 10-minute abs workout from fitness trainer Maddie Lymburner, who goes by MadFit on YouTube, is also done without equipment, so you can do it pretty much anywhere. Though using a yoga mat will ...