How you take action
You act by thinking out loud. A conversation, a message, a quick plan sketched on paper: this is how you get started. The mutable mode keeps you flexible, and you change direction easily when new information arrives. You tend to work in bursts and switch between tasks, which can look scattered from outside but often keeps your energy high.
Ambition and work
You are motivated by variety and mental challenge. Astrologers link Mars in Gemini with work that involves communication, trade, teaching, writing, technology or moving between people and places. You may build a career out of several threads rather than one straight line. What drains you is repetition with no room to learn something new.
Anger and conflict
Your anger usually comes out in words. You argue quickly and well, and you can find the sharp phrase faster than most people. Debate can even feel enjoyable to you. The risk is that a clever remark lands harder than you meant it to, or that you argue a point for the sake of winning. Remembering that the other person is not an opponent in a debate keeps disagreements fair.
Desire and attraction
Your desire starts in the mind. Wit, quick replies and an interesting conversation draw you in more than almost anything else. Astrologers often say Mars in Gemini enjoys flirting with words and needs variety and play to stay engaged. A partner who can surprise you, tease you and keep talking is usually the one who holds your attention.
Physical energy
Your energy is nervous and quick rather than slow and steady. Traditionally this placement is linked with enjoying varied, light, fast-moving activity: cycling, racket sports, dance, walking while you talk. Mixing things up tends to keep you interested. Giving your mind a rest matters as much as moving your body, because a busy head can keep you wired.
Challenges
Scattered energy is the main hurdle. You may start many things and finish few, or talk about plans instead of carrying them out. Restlessness can make it hard to stay with one goal through the dull middle part. Choosing fewer projects and seeing them through, and letting actions follow words, turns your quickness into real progress.
How long Mars stays in Gemini
Mars takes about 687 days to orbit the Sun, so seen from Earth it comes back to Gemini roughly every 1.9 years. Between 1960 and 2040 it passes through Gemini 43 times. A typical passage lasts 45 days, and the shortest 43 days. The longest, from Aug 20, 2022 to Mar 25, 2023, adds up to 217 days in Gemini, because Mars turned retrograde in or near the sign. In this period, 5 passages last more than 100 days. Everyone born during the same passage shares a Mars in Gemini, so the house and aspects of Mars in your own chart add the personal detail.