In astrology signs have given their natural element which vata, pitta and kafa so what are that
vata means vayu(air) , pitta means agni(fire)  and kafa means liquid(water)  so person having prominent planet in these signs is known as below given prakriti(nature). suppose vata means vayu so it indicates flow of air inside the body organs like breathing(muscles contraction, nerves, pressure, flow of blood, flow of neurons, lungs)  pitta means agni which indicated fire like stomach acid(intestine, gall bladder, liver, pancrease)  and kafa means liquid (utarus, urinary bladder, gall bladder, digestive juice, bile juice, kidneys, stomach, blood, spine phlegm) .

Vata(Air) : Gemini, Virgo, Libra, Capricorn and Aquarius.

Pitta(Fire) : Aries, Leo, Sagittarius and Scorpio.

Kapha (Water) : Taurus, Cancer, and Pisces.

Suppose Moon the kafa planet is in leo and leo represent Pitta(fire) and moon represent liquid, fluid, digestive juice which means kafa so what will happen when water goes to fire, fire will go away so it reduce the pitta(fire) , the digestive juice as a result person will face digestive issues.

Same way if what if Sun is in Cancer, sun represent pitta, agni(fire) because of it’s hotness and cancer represent kafa, cancer is water a cold water so what will happen when sun goes into cancer all the fire will go away as a result person will face digestive issues.

Suppose Jupiter is in taurus, cancer or pisces so what does jupitar represent, simply fat so if Jupiter a kafa planet sits in these kafa sign in the ascendent so it may help person to increase weight it may also because of laziness because these sign represent laziness too.

If Saturn and Mercury sits in Vata sign then we know both lacks moisture and also dry and airy so person may have dry skin,tall body structure, skinny body.

If Mars is in Cancer and Pisces which are kafa dominant sign, so what does Mars represent, energy, vitality, blood flow, activity, agility, aggressiveness, fire, heat so when mars goes into these signs the energy of mars bit of fade away and person tends to calm, lazy, less in activities, low blood flow and pressure.

same way if mars is in Pitta sign then person will always be aggressive, active, energetic, hot headed, high blood pressure,large appetite.

If mars in gemini a Vata sign then person will have good catching power, knowledge, active, good flow of blood.