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. There’s a lot of ...

Add Yahoo as a preferred source to see more of our stories on Google. Meet the experts: Jacqueline Kasen, CPT, is a Miami-based coach, master trainer, and senior director of group fitness at Anatomy.

There are a number of ab exercises you can do at the gym to strengthen the entirety of your core. By using a cable machine, suspension trainer, or barbell, you can amplify simple ab exercises. Below ...