A comprehensive guide featuring 20 proven strategies for smart and healthy weight gain. Includes practical advice on eating in a calorie surplus, consuming meals every 3-4 hours, protein intake goals, adding healthy fats, choosing complex carbohydrates, and drinking calorie-rich shakes. Covers gym recommendations like progressive overload, compound lifts, limiting excessive cardio, optimal sleep, tracking food with calorie apps, pre-bed meals, creatine supplementation, psychological tricks like using bigger plates, stress management, avoiding water before meals, and tracking progress with photos.