Is it the abdomen or stomach? Polls reveal that when asked about their core, most people immediately think of their abs. But your core is actually composed of 6 groups of 29 muscles located in your upper thigh, lower back, and the sides and front of your stomach. Believe it or not, it’s possible to possess a strong core beneath layers of fat. While this piece of information is good to know, how can you tell if your core is weak or strong? If you experience frequent tightness and/or pain in your lower back, a weak core could be a part of the problem. Since core muscles also protect your…