WANT TO KNOW HOW TO BUILD A STRONG CORE? Let’s talk core, trunk and ab strength. First things first, get off your back when training your core. I advise for only a few exercises that have you belly up. The exercises here are in order beginner to advanced from top to bottom, respectively. I progress core exercises by increasing time, reps, and decreasing stability. This article is great for those exercises that will also train other muscles! The benefits are endless!