Mars represents energy, your ambition, independence, determination, aggression, ruthlessness, courage, anger, stamina, and prowess. A strong mars can show someone that has the motivation and drive to fulfill their desires. They won't stop until they achieve their goals and aspirations. They may have a natural inclination to protect and defend others.  On the contrary, a weak mars may show someone with low energy and lack of desire. They may have low vitality. They may also experience a low self-esteem and find it difficult to move forward. 
Mars represents the adrenal glands, blood, and muscles.. the parts of the body required to take action and move forward. 
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