Muscle adaptation refers to the process by which muscles change in response to physical activity or training. When you engage in exercises like weightlifting or running, your muscles experience stress, leading to small tears. As these tears heal, the muscles become stronger and more efficient, allowing for improved performance over time. This adaptation occurs through various mechanisms, including increased muscle fiber size and changes in energy production. Factors such as nutrition, rest, and exercise intensity play crucial roles in how effectively muscles adapt. Understanding muscle adaptation can help individuals optimize their training programs for better results.