Tissues: A tissue is a group of cells that have a similar shape and function. Different types of tissues can be found in different organs.

In humans, there are four basic types of tissue : 

1. Epithelial 

2. Connective 

3. Muscular and 

4. Nervous tissue

Epithelial tissue: Epithelial tissue covers the surface of the body. It forms the lining for most internal cavities. Its main function is to provide protection to inner lining of organs such as-face, skin, intestine, lungs, blood veins. The skin is an organ made of epithelial tissue, which protect the body from dirt, dust, bacteria etc.

• Connective tissue : It is most widely distributed tissue in the human body. Its main example is bones. 
• Muscular tissue : Muscular tissue varies with function and location in the body. 
• Nervous tissue : It is the main tissue composing of two parts of the nervous system: Spinal cord and brain.

Exercises and games affect both the physical and mental components of the body. It helps in the better growth of bones and muscles. It helps in the better functioning of the body. During exercise the flow of blood to the various organs and regions of the body is increased. The strength of the body is also increased. Further it increases the immunity of the body to diseases. But of course, good exercise should also be backed by a healthy diet.