The "Minimum Effective Dose" (MED) refers to the smallest amount of a substance or intervention needed to achieve a desired effect. This concept is commonly applied in fields like medicine, fitness, and pharmacology, where understanding the least amount required can optimize results while minimizing side effects or unnecessary exposure. In exercise science, for example, the MED can help individuals determine the least amount of physical activity needed to improve health or fitness levels. By focusing on the MED, people can avoid overtraining and ensure they are using their time and resources efficiently, leading to better long-term outcomes.