73. In the first place， extra studies bring about unhealthy impacts on physical growth of children. Educational experts point out that， it is equally important to take some sport activities instead of extra studies when children have spent the whole day in a boring classroom.
74. Children are undergoing fast physical development； lack of physical exercise may produce disastrous influence on their later life.
75. In the second place， from psychological aspect， the majority of children seem to tend to have an unfavorable attitude toward additional educational activities.
76. It is hard to imagine a student focusing their energy on textbook while other children are playing.