7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser

Strong abs won’t just make you feel more comfortable in a bathing suit or bikini; your core is the source of power for your entire body. It includes not only the front of your torso, but also your hips, pelvic floor, back and the muscles that wrap around the side of your body. Everything else — arms, legs, head — are an extension of your core, so it’s important to strengthen this area of your body for a variety of functions, including stability.