A thing to remember here is that these posts are strictly meant for the particular planet position. Like, today we are looking at Mars in Pisces, so the description given here may change for you if your Mars is although in the sign of Pisces but with conjunction with or aspected by other planets.
So, lets see what Mars can do in Pisces without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent --
Mars represents our will power, courage, ability to take actions, aggressive nature, anger, our fighting ability, brother, male friends, a boy friend for a girl, a soldier, an athlete and real estate etc.
As Pisces is the 12th sign of zodiac belt, it represents the same energy and things which are represented by 12th house such as Isolated Places, Spirituality, Imagination, Other Dimension or Other World etc. Besides these things, it also represents your Hidden Talents, Ability to work in background, Spiritual Self etc. Pisces is consisted of last 2 and half nakshatra, i.e. Purva-Bhadrapada, Uttara-Bhadrapada & Revati. Pisces' lord is Jupiter.
Now, Mars is in Pisces which means person's energy is going into Spirituality and Isolation. So this position makes a person take actions in spiritual matters. These people will dedicate their great time in spirituality and meditation. In general sense, it shows a person who does his work in a very isolated place, who give much time working in his lab or library rather than working with other people. Their work ethics get activated when they are all alone, we can say that they can concentrate much better in an isolated place than in a group setting. As Pisces is also a sign representing feet in human body and Mars represents action, these people can become athletes or very good dancers. Overall, now Mars' energy is going to Spirituality or Isolation.
As always, Mars' placement in different nakshatra will change this scenario as per the position of Nakshatra Lord. If Mars is in Purva-Bhadrapada Nakshatra, its lord Jupiter's position would impact Mars. If Mars is in Uttara-Bhadrapada Nakshatra, its lord Saturn's position would impact Mars. Likewise, if Mars is in last nakshatra Revati, its lord Mercury's position would impact Mars.
Overall, Mars will be impacted most by the condition and position of Jupiter in Horoscope as Jupiter is lord of Pisces.
Vishal S Saxena - Astrologer