Core strength refers to the ability of a person's abdominal and back muscles to support their spine and maintain proper posture. It is an essential component of overall physical fitness, as it helps prevent injuries and supports optimal body functioning. Core strength can be developed through various exercises such as planks, crunches, leg raises, and other abdominal and back-strengthening activities. A strong core not only improves posture but also enhances balance, stability, and coordination during physical activities.