Biomechanics is derived from Greek words, BIO + MECHANICS. Bio means living thing and mechanics is a field of physics. Thus, it is the branch of science which deals with the forces related to body movements.

Biomechanics is defined as systematic study of mechanics of body joints. According to Wikipedia, “Biomechanics is the study of the structure and function of biological system of humans.”

Effects of Exercises on Muscular System : Following changes in our muscular system can be seen if exercises are done on regular basis :

1. Efficiency in the Movements of Muscles.
   The movements of muscles become efficient and smooth. The movements during different activities become attractive.
2. Change in the Connective Tissue. The connective tissue, which connects fibres, becomes powerful. These tissues can bear stress of strenuous activity and can be extended up to some degree.
3. Controls Extra Fat. Regular exercise controls the extra fat of body. Exercises burn the calories which is taken in the form of fat.
4. Musele Remains in Tone Position. When exercises are done on regular basis then our muscles remain in toned position. Indeed, muscle remains under some degree of contraction. Muscle becomes firm and maintains a slight, steady pull on the attachments.
5. Formation of More Capillaries. When exercises are done, the colour of muscles is changed, because a number of new capillaries are formed for a better efficiency of blood circulation.
6. Change in Shape and Size of Muscle. Through regular exercise, the shape and size of muscle is changed. In fact, cells of muscles are enlarged which change the shape and size of muscle.
7. Delays Fatigue. Regular exercise delays fatigue. The fatigue is mainly due to formation of carbon dioxide, lactic acid and acid phosphate. The accumulation of C02 acid phosphate and lactic acid becomes less in an individual who performs exercise regularly, Hence, fatigue can be delayed if exercises are performed daily.
8. Improves Reaction Time. Due to regular exercise, the speed of nerve impulses increases which ultimately improves the reaction time. These nerve impulses move very quickly through motor nerves from nervous system to muscle fibre. Owing to this the reaction time improves.
9. Body Posture Remains Correct. By doing exercise regularly, the strength of muscles increases, which in turn, keeps the body posture in correct position. The postural deformities do not occur. If there is any physical deformity, it is removed by doing regular exercise.
10. Non-functioning Fibres Become Active.
    When we do not do any strenuous work, all the muscle fibres of our body do not perform any work. In fact, these fibres do not need to be active. But when we perform exercise regularly, the non-functioning fibres also begin to be active. Consequently, the strength of the body increases, because the total contractile power of the muscle fibres increases.

Physical fitness : It is the ability of an individual to carry out his daily routine without getting tired and having extra amount of energy to meet any kind of unforeseen emergency. Physical fitness means the capacity to do the routine work without any fatigue or exertion and after doing the work the person has power to do some more work and recovery is quicker.

Pragmatism means thinking of or dealing with problems in a practical way, rather than by using theory or abstract principles. [formal] She had a reputation for clear thinking and pragmatism.

Somatotypes are a set of generalized body types. Psychologist William Sheldon came up with somatotypes in the 1940s and they were one of the biological theories developed in this time period that attempted to explain and predict crime based on a person's body type. These body types broke down into three categories: ectomorphs, endomorphs, and mesomorph.