Best Carbs for a Lean and Strong Body Carbohydrates are often misunderstood in the fitness community. Many people believe that cutting carbs entirely is the key to a lean body. However, carbs are essential for providing the energy needed to fuel workouts and recovery. The key is choosing the right type of carbs. Here’s a list of the best carbs for a lean and strong body. 1. Sweet Potatoes: A Nutrient-Dense Carb Sweet potatoes are one of the best sources of complex carbohydrates.