Yes! Rucking builds muscle by combining the benefits of resistance training and cardio in a single activity. When you walk with a weighted backpack (a ruck), your body engages multiple muscle groups, particularly in the legs, back, shoulders, and core, to carry the load and maintain balance. The added weight increases the intensity of the workout, forcing your muscles to work harder with each step, which leads to muscle strengthening and growth over time. Unlike traditional cardio exercises, which primarily focus on endurance, rucking also applies resistance to the body, challenging muscles in a way that promotes hypertrophy (muscle growth) and improved muscular endurance. This combination helps build lean muscle mass while improving overall fitness.