The antonyms for the word "over sets" can be "under sets" or "balanced sets". Over sets refer to exercising with too much weight or intensity, which can cause fatigue, injury, or muscle strain. Under sets are the opposite, which means performing exercises with too little weight or intensity that does not challenge the muscles. Balanced sets, on the other hand, are the ideal way to exercise, which involves lifting weights that are challenging but still within one's capability. Balanced sets provide maximum benefits for the body, such as increasing strength, stamina, and overall fitness. Therefore, it is important to find the right balance when exercising to avoid any negative consequences.