Article in English: Before your child or adolescent participates in any form of strength training it’s important they consult their doctor. Muscle building routines are slightly different for this age group as their body is still developing and growing. Too much and too hard exercises can cause injury that have lasting effects to a young body. Receiving a medical evaluation beforehand, can help you and your child identify:  Training goals. Understanding the proper techniques. Risk factors, such as injuries and the use of steroids or other supplements. Please note that since the overall goal of strength training is to enhance muscle size, a discussion with a pediatrician about steroid use is highly important, especially if your child is involved in a competitive training program. This type of training mainly focuses on weight lifting but exercises using your own body weight (such as sit-ups and push-ups) as well as endurance and agility exercises can also be included to increase muscle strength and size.  Weight lifting is the most common strength training technique used in sports and basic workouts. To get started, consult a fitness trainer who can help you or your child learn each exercise and how to perform it correctly. Always warm up to reduce risk of injury by doing at least 5 to 10 minutes of cardio. Stretch lightly before each exercise and after the workout to increase muscle flexibility. Using weights that are too heavy can lead to an injury. Also, it is essential you learn to do each exercise correctly before adding extra weight.   Maintain your body mechanics during each move: move slowly, breathe, and understand the complete range of motion. If you do exercises hastily or using the wrong range of motion, you can risk injury. Listen to your body. The intensity of your workout depends on the number of repetitions, the weight, and how long you rest before sets. Don’t over exert yourself. However, you should still be pushing yourself. If you don't challenge your muscles and start moving on to heavier weights, your muscles...

Summary in Vietnamese:
Tham khảo ý kiến của bác sĩ khoa nhi. Thực hiện bài tập rèn luyện sức mạnh cơ bắp. Bắt đầu với tạ nhẹ và dần dần chuyển sang tạ nặng hơn khi cơ thể bạn trở nên khỏe mạnh hơn. Tránh xa bộ môn powerlifting hoặc nâng tạ thi đấu. Thêm bài tập aerobic vào chương trình luyện tập mỗi tuần. Biết rõ rủi ro. Tránh tập luyện quá nhiều.