146 kg or 146 kg? 146 kg should be considered very light. 13 years old and grow to 1.7 meters, you still have a future. If it is kilograms, you need to reduce it slowly and walk around every morning and evening. Half an hour, you can walk faster. There is no shortcut to lose weight, only keep exercising. If it is too heavy, don't run for the time being, which will increase the burden on your knees. Just pay a little attention to your diet. Dieting is not the way to lose weight. Pay attention to your nutrition. Eat well, staple food is necessary, but don't overdo it. Nutritionists say that every meal has a fist-sized staple food.