Cancer is a movable water sign ruled by Moon, which is a feminine watery planet. Mars on the other hand is a fierce and masculine planet but it shares a friendly relationship with Moon, so the placement of Mars in Cancer turns out well for a native. If you have Mars in Cancer, you are likely to value your physical energy more than your emotional strength. A mix of Moon and Martian energy make the person mentally strong and resolute since Moon represents mind and Mars represents power. Such natives need an outlet for their reserve of energy, and they tend to express their energy in an emotional fashion due to the influence of Moon.
These natives are not demanding and assertive; instead, they tend to be compromising in nature. However, that doesn’t mean that you can make them compromise on their beliefs. Natives with Mars in Cancer tend to be independent and hard working. They make serious efforts to realize their ambitions. Due to overflow of feelings (Moon) and sensual needs (Mars), these people tend to be overly passionate in love and sexual matters. They do well in Sports, especially water based. Sailing also appeals a lot to these people.