Your core is constantly on the clock, stabilizing your body during squats, sprints and even bicep curls. It’s no wonder it adapts easily to traditional abdominal exercises that don’t use extra weight and require minimal range of motion. So if your abs training has hit a stalemate, it’s time to enlist advanced exercises that will challenge your core like never before—and we’ve got just the routine. We borrowed these seven killer moves from fitness megastar, Bella Falconi. Try them out for a few weeks to improve your core strength and carve crop-top worthy abs.