Final answer:
The healthy range of curl-ups for 12-year-old males is usually around 15-20 repetitions, placing importance on proper form and technique.B) 15-20 Repetitions
Step-by-step explanation:
The question on the healthy range of curl-ups for 12-year-old males relates to the subject of health and is targeted towards middle school students. The suitable range of curl-ups for any individual can vary widely based on their fitness level, but as a general guideline, a healthy range of repetitions for a 12-year-old male might be closer to 15-20 repetitions, depending on the source of the fitness standards. It is important for students to focus on form and technique over quantity to avoid injury and achieve the best results.