Children’s physical activity in kindergarten is affected by gender, age, BMI and motor skill development. There was a significant correlation between gender and physical activity. The study believed that the level of physical activity intensity and the time spent on physical activity of boys were greater than that of girls. Compared with boys, girls spend more time sitting and less time in physical activity [10] [11] [12] [13], indicating that boys are more active than girls. At the same time, the overall level of physical activity of boys and girls showed a decreasing trend with age [9] [12] [14]. Gender should therefore be considered as a factor in physical activity arrangements for children in kindergartens. In young children in the study of relationship between BMI and physical activity, studies have shown that BMI (normal, overweight, obesity and physical activity levels show significant differences, present two different results: XiaoJun ship [14] in the research of preschool children’s physical activity and motor skills, the relationship between obesity in children of high strength showed a negative correlation between physical activity and BMI; There are also some scholars who believe that there is no statistical significance between physical activity intensity level and BMI (normal, overweight, obese) [15]. The contradictory results of this study may be due to the differences in participants and data collection, so further research is needed. In the study of motor skill development, there is a positive correlation between physical activity intensity level and motor skill development. The level and total time of moderate to high intensity physical activity of preschoolers aged 3 - 6 years were significantly correlated with basic motor skill level [14]. The longer the duration of high intensity physical activity, the more advanced the level of motor development; Children with shorter physical activity time lag behind in motor development [9]. Among the personal factors, motor skill development is an important factor affecting children’s physical activity ability. Therefore, children’s physical activity intensity level and total physical activity time have a direct impact on children’s motor skill development.

Family is an important factor affecting the level of physical activity of children and adolescents. For families, in addition to providing material support to children, parents’ own exercise level, parents’ attitude towards exercise and parents’ physical education guidance will also affect children’s exercise behaviors [16]. Therefore, this paper mainly explores whether parents’ PA (physical activity) level, parents’ attitude and parents’ physical education guidance will produce significant differences in children’s physical activity in kindergarten. Combing literature found that learning about family level of children in the kindergarten are the influence of physical activity, the results of the study contradiction: domestic scholars Zhou Jialin [9] research found that parents’ physical activity levels did not affect physical activity within the children in the kindergarten, and study abroad do show the differences of two different results: First, the physical activity level of the mother can promote the physical activity intensity level of the girl, while the father has no effect [17]. Second, father’s physical activity level will have an impact on children’s physical activity level, while mother’s physical activity level will not have an impact on children’s physical activity in kindergarten [18]. Although some studies believe that parents’ attitudes towards exercise and their children’s exercise have no influence on children’s physical activities in kindergartens [9], some studies have found that parents’ physical education guidance to children has positive significance in promoting the development of physical, psychological, intellectual and comprehensive qualities [2]. The above results may be caused by other factors such as participants and the environment atmosphere in the kindergarten, so more scholars need to further explore the family level.

The improvement of children’s physical activity level has a direct impact on children’s guidance and care by adults. Kindergarten is the main place for children to do physical activities except for their families, so teachers are an important factor influencing children’s physical activity except for parents [9] [19]. The influencing factors of teachers are divided into three aspects: teachers’ organization and guidance, relevant sports knowledge and physical activity level. In the process of the study, it was found that the agility, jumping ability, movement speed and control of children’s small muscles were positively correlated with teachers’ organization and guidance. In addition, teacher-child interaction has a certain correlation with children’s exercise level, which is mainly reflected in children’s overall coordination, small muscle agility, jumping ability, motor speed, motor control and other aspects [19]. Among them, teachers’ encouragement plays a positive role in promoting children’s participation in physical activities, which is manifested in two aspects: verbal encouragement and action encouragement [13]. In the process of teacher-child interaction, the higher the expectation of teachers on the effect of children, the higher the level of physical activity of children [13]. In addition, the higher the teacher’s exercise-guided self-efficacy, the higher the children’s physical activity level [13]. In the relevant research on the PE knowledge of preschool teachers, some scholars point out that the PE knowledge and physical activity level of preschool teachers will have an impact on children. Teachers who score high on PE knowledge and believe that physical activity can bring benefits can design a higher level of physical activity content to improve the physical activity level of children. In addition, children are a group that lacks autonomy and is good at imitation. The sports performance of kindergarten teachers with strong physical activity level in their daily work will bring important positive influence to children. In addition, the investigation and research found that in kindergartens without full-time PE teachers, children’s physical activities are higher than those with full-time PE teachers. The reason is that full-time PE teachers tend to structure the curriculum, while non-full-time PE teachers give play to children’s independent initiative [9]. Kindergarten teachers’ sports behavior plays a positive guiding role in children’s physical activity in kindergarten and can promote children’s physical activity level.

Students spend most of their non-sleeping time at school, which provides opportunities for physical activity in addition to teaching subjects characterized by sedentary behavior. The school is regarded as the main place to promote students’ physical activity [20]. This study mainly expounds the relationship between physical activities in kindergartens and children from three aspects, including field area, sports facilities and sports environment. There is no significant difference between different site area and physical activities of kindergarten children [9]. Although children are more inclined to choose large exercise areas, there is no significant difference between different area sizes and children’s physical activities [21], so the impact of field area on children’s physical activities is small. Various facilities are placed in the sports facilities area, such as amusement facilities area, open area, sand play area, climbing area, etc., which are the main sports environment contributing to the physical activity intensity, and also the main place for children to carry out outdoor activities. Different areas contribute different levels of physical activity intensity: children in the recreation facilities area produce the smallest amount of physical activity; the open area has the largest number of people playing and the physical activity intensity can reach the moderate level of physical activity; climbing area is the area that can contribute the most intense physical activity, but it is less attractive to children [9] [12] [22]. In the sports environment of kindergarten, it is mainly composed of indoor and outdoor. The indoor environment is mainly dominated by classes and the intensity of physical activities is small, while the outdoor environment of kindergarten is the main space for children’s activities. Among them, the natural environment in the outdoor environment of kindergarten is the most attractive to children [9] [23], and the display of landscape, color collocation and image design in the outdoor environment have a positive impact on children’s psychology and physiology [23]. In the sports environment, children have the highest need for the natural environment of outdoor environment, generally like the natural elements, and the outdoor environment is full of exploration, children’s interest and participation [9] [22] [23].