The antonyms for the term "over-extended" include words such as streamlined, efficient, manageable, controlled, balanced, and disciplined. These words connote a sense of being focused, with a clear understanding of one's limitations and an ability to stay within them. Streamlined implies a simplified process with fewer elements, balanced suggests stability, harmony and proportion, disciplined indicates a controlled and organized approach. Efficient implies achieving maximum productivity with minimal resources. With these antonyms, we see that there are ways to be productive and successful without pushing oneself beyond one's means, leading ultimately to burnout and exhaustion.