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A closed-kinetic-chain movement refers to an exercise where the distal segment of the body (such as the foot) is fixed in place and cannot move freely. This type of exercise usually involves multiple joints and tends to engage more muscle groups, providing functional benefits and stability. The body-weight squat is an excellent example of a closed-kinetic-chain movement because the feet are planted on the ground throughout the exercise. As you perform a squat, the motion involves bending at the knees and hips while the feet remain stationary, allowing the body to engage the muscles of the thighs, hips, and core effectively. This integrated movement pattern mimics activities in daily life, such as sitting down or standing up, making it functional and beneficial for overall stability and strength. In contrast, the seated leg curl and the seated leg extension involve movements where the feet are not fixed in the same way. In these exercises, the legs move freely on machines, isolating particular muscles without the same level of engagement of multiple joint systems. The standing lateral deltoid raise focuses on shoulder motion and involves lifting weights without leg fixation, thus lacking the characteristics of a closed-kinetic-chain movement.