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There are three types of levers: first-class, second-class and third-class lever. The class of lever depends on the direction of two main forces: the force of effort and the force of resistance. Most of the levers in the human body belong to the third type, but all the three types of levers can be found. The objective of this work is to identify the first, second, and third class levers in the musculoskeletal system, and to provide five exercises for the dominant lever class.
Musculoskeletal system and levers
The lever in the musculoskeletal system consists of the lever, fulcrum, load and force. The levers of the first class are pry bars, crowbars and so on. In the human body this is gastrocnemius inverted, for example. Nodding the head is the example of the first-class lever, too.
The lever of the second class is wheelbarrow, and in the human body this is gastrocnemius during standing. When somebody pushes the object with all his body he uses as the lever of the second class.
The third class levers are tweezers and the most muscles, biceps brachia, hamstring muscles, and so on. The forearms are the third-class lever, as well as the legs with the fulcrum in kneecap. Every finger can be the third-class lever, and the end of every limb, too.
The exercises for the third-class lever in human body can include: chin-up, press-up, leg press, the half squat with the barbell weight across the shoulders, bicep curl exercises. These exercises provide the load on the main groups of muscles.

 
References
Kreighbaum, Ellen, and Katharine Barthels. Biomechanics: A Qualitative Approach for Studying Human Movement. New York: Allyn and Bacon, 1996.
Marieb, Elaine. Essentials of Human Anatomy and Physiology. San Francisco, CA: Benjamin/Cummings, 2000.