The antonyms for the term "sit-downs" are numerous, as the concept implies a stationary or sedentary position. Some antonyms relevant to physical movement or exercise might include jumping jacks, running, or lifting weights. Other antonyms that denote social or political activity might include demonstrations, rallies, or protests, as these events generally require a large group of people to stand or move about. In a broader sense, antonyms for "sit-downs" might include anything that involves physical or mental movement, such as hiking, reading, or brainstorming. Ultimately, the antonyms for "sit-downs" are diverse and varied, covering a wide range of physical and conceptual activities.