Pain that occurs in the calf muscle on the lower part of the leg often is the result of a pulled or torn calf muscle. This is called a calf strain or a calf pull. It occurs when part of the muscle of the lower leg (gastrocnemius or soleus) is torn away from the Achilles tendon.  

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Hamstring injuries are common among high speed and kicking activities such as runners, footballers and martial arts.

The hamstring muscles run down the back of the leg from the pelvis to the back of your knee. An injury can range from minor strains to total rupture of the muscle. The four muscles that make up the hamstrings are the semitendinosus and semimembranosus (medially) and the biceps femoris - long and short head (laterally).

A sudden, sharp pain in the back of the thigh that may stop you mid-stride characterizes a hamstring injury. After such an injury, the knee may not extend more than 30 to 40 degrees short of straight without intense pain. 

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