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Lose weight and exercise muscles.
If you want to grow muscles, squat is better, but squat with weight is better. Weight-bearing can stimulate muscle growth, but if you want to lose weight, weight-bearing is not good. Is it uglier if you don't lose fat but your muscles get bigger? So lose weight first and then build muscles.

As for children who affect their height, it is better not to practice muscles and do more aerobic exercise. It's better to ride a bike or swim. If you are fat, you'd better not run. Why ask questions about the upper body and lower body? Aerobic exercise is generally an all-round exercise of muscles. If you want to compete, that's another matter.