Effects of exercise on muscular system are :

1. Increase in the thickness of the muscular tissues. 

2. Increase in the quantity of proteins required for the muscular growth. 

3. Acceleration of the oxidisation process of carbohydrates and fats. 

4. More strength and flexibility, hence reducing the likelihood of injury to the body. 

5. Loss or lowering of quantity of fats in the body. 

6. Increase in the density level of enzymisation and Glycogen storage capacity. 

7. Production of more energy due to increase: in the efficiency of A.T.P. and P.C. system. 

8. Increase in glycolitic retention. 

9. Increase in fat free weight of the body. 

10.Increase in muscular strength and muscular weight bearing power with increase in the thickness of the muscular tissues. 

11.Improved storage of Oxygen with the increase in Miglobin components. 

12.Increase in the volume of blood flow to blood tissues. 

13.Other positive effects as more flexible back, stronger heart muscles and improved muscles control. 

14.Enhanced growth in the number of Mitochondria (cells) generate more muscular energy.