Changing lifestyles reduce the time spent by children on physical activity during the day. The result is an increasing frequency of childhood obesity, which has become one of the most common chronic diseases of childhood. Furthermore, the treatment of obesity in childhood is quite difficult, and the most common problem is non-compliance with obesity treatment. The path that will facilitate the adaptation to treatment comprises nutrition regulation and increased daily physical activity and psychological support. Diet alone leads to a significant reduction in both fat and non-fat body mass. However, adding exercise to dietary therapy improves weight loss by maintaining non-fat body mass. Even though exercise alone has little effect on weight loss, it provides a significant reduction in mortality. Moreover, regular physical exercise is also an important factor in regulating body composition during growth. However, changes in the child’s body during growth affect the motor power and performance, so it is necessary to plan the exercise according to the individual characteristics, age and sex of the child. Short-term frequent exercises are more entertaining and more accessible forms of exercise (dancing at home) for children, and enhance compliance with treatment. Starting treatment as soon as possible will also increase behavioral effectiveness and compliance. This paper focuses on the basics of exercise therapy, which is extremely beneficial for both healthy and obese children.