Most machines you find at the gym are engineered to train specific muscles—usually a primary muscle and one or more secondary muscles. The chest press machine works your pectorals and shoulders, while ...

But beware! Not all machines are created equal, and some might be holding back your progress without you even realizing it. Did you know that choosing the right machines can make a huge difference in ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Machines are one of ...