The antonyms for the word "most unexercised" can be "well-exercised," "active," "fit," "toned," "athletic," "energetic," "trained," "conditioned," "strong," "flexible," "nimble," "mobile," "robust," and "vital." These words indicate a state of physical fitness and activity, indicating that the person has been exercising and engaging in physical activities to maintain their health and fitness. They are not sedentary and are not experiencing a lack of exercise or physical activity. These antonyms suggest an active lifestyle that involves regular training, physical challenges, and being physically able to perform demanding tasks that require strength, endurance, and agility.