Mars
In Greco-Roman mythology Mars was the god of war. The astrological archetype of Mars is associated with the action principle in life. In the external world this can show up as forceful movements and the act of catalyzation. Within the human psyche Mars is reflected in our ability to act. When our ability to act gets frustrated we can feel anger and aggression. Thus the spectrum of symbolism of the astrological archetype of Mars includes, on the challenging end, anger, aggression, and violence. On the rewarding side of the spectrum Mars is reflected as assertiveness, bravery, motivation, as well as competitiveness and athleticism.
The planets aligned with Mars in our birth charts reflect the particular style with which we engage with the world, our pep, and the character of our motivation.