The nutrient crucial for repairing tissues during recovery from exercise is protein. When you exercise, especially during strength training, microscopic tears occur in the muscle fibers. Protein helps to rebuild these fibers and facilitates muscle growth and recovery. Consuming adequate protein post-exercise not only assists in recovery but also enhances muscle mass and strength over time. Sources such as lean meats, dairy, legumes, and protein shakes can help meet the body’s protein needs effectively.