You are still in adolescence and your body is developing rapidly. This phenomenon is only temporary. When you get older, you will gradually have a perfect curve. If you want to lose weight now, I recommend doing sit-ups. Can exercise waist strength, perfect back. Stick to it and you will see the effect. It is recommended not to turn the hula hoop, because you are funny. When you turn, the hula hoop hits your kidney, which is not good for your health. The important thing is to persevere. I insisted on doing it 20 times a day at first. Add it slowly later.