Physical activity isn't a standard component of a traditional school day. Instead, it's become an event that parents have to rigorously plan outside of class time. Experts seem to agree that responsibility for physical activity ought to fall within the educational system and its regular school schedule, and not with after-school or evening programming that many children are unable to participate in.
Physical activities boost brain function and improve health in a variety of ways. Kids who regularly exercise sleep better and have better immune system function.
Gym classes provide students with physical exercise on a consistent basis. It is particularly important for the physical well-being of children who do not engage in physical activities outside of school. A good physical education class will feature activities that raise the heart rate, increase the pulse rate and rev up metabolism. According to the American Heart Association, gym classes can help teach children skills that can help them be active their whole lives. The physical exertion also helps the mind, as children will find they are able to think more clearly and are able to focus better in other classes following a physical education period.
With the recent CBSE circular asking for schools to have one hour for Physical Excercise, schools will have to think about the variety they can bring in so that the students can benefit the maximum.
(Indebted to various sources)