<human>:  What does the ideal workout plan look like for someone wanting to gain muscle mass?
<bot>: The ideal workout plan for someone wanting to gain muscle mass should include a combination of strength training exercises that focus on increasing the size of the muscle fibers and endurance training exercises to increase the muscle's capacity for work over an extended period of time. Additionally, to maximize muscle growth, it's important to ensure your workout plan incorporates ample rest days, allowing your muscles time to recover and to avoid overtraining. For strength training, it's recommended to include a variety of movements such as squats, deadlifts, barbell presses, weighted curls, and rows. For endurance, a combination of HIIT (High-Intensity Interval Training) and LISS (Low-Intensity Steady State) cardio is optimal. It's also important to include a adequatenutrition plan, consisting of plenty of protein-rich foods, complex carbohydrates, healthy fats, and vitamins and minerals.