Nowadays, with the development of  multiple educational ways, there has been a split in opinions on whether it is necessary for 
 to do 
 in  
. Some people believe that exercise is an important part of 
 life, while some people hold the idea that 
 is an optional class. As far as I am concerned, taking 
 classes is essential for all the youngsters who have the basic ability to attend. 
On one hand, doing 
 obviously ensures both body and mind health which plays a role in the growth of each child. Under the heavy stress given by academic transcripts and decreasing positions to get into better schools, more and more offspring sacrifice exercise time to study. In 
 situation, the number of 
 who are bothered by obesity and mental diseases grows dramatically. 
, doing 
 and engaging in outdoor activities help a lot, which builds stronger muscle and bones during  childhood. According to a survey in the University, the students who do better in their careers have the habit of exercising every day. 
, 
 is a part of 
 life that 
 and 
 departments should pay attention to . 
, for some young people who are not interested in 
, doing these activities regularly is a kind of punishment. It is hard to deny that some 
 who enjoy staying by themselves or are allergic to the environment for 
 may better have an option of getting 
 lessons. 
, some genius in history quit other activities except researching in their regions, they used all their spare time to study deeper and harder. 
, in some cities, 
 are not in the examinations for high schools, which reflects that 
 is not a general lesson that everyone should take. 
In the nutshell, I strongly reckon that 
 can be optional in their types and  terms, but it is significant for all the young ones to take some exercise during their 
 time. Because for heir in  modern society, the categories of 
 are numeral that we can make a choice according to our own preferences. 
, doing 
 only occupies less than one hour in a whole day, it is really convenient now for us to do some simple exercises.