Muscle groups are collections of muscles that work together to perform specific movements in the body. They can be categorized into major groups, such as the chest, back, arms, legs, and core. Each group consists of various muscles that contribute to strength, stability, and mobility. Understanding muscle groups is essential for effective exercise and fitness routines. Targeting specific muscle groups during workouts can help improve overall strength and endurance. For example, exercises like push-ups focus on the chest and arms, while squats primarily engage the legs and core.