the previous dhatu and gets nourished by it. Rasa is the first dhatu to be formed and is the metabolic end product of the digestive processes. The metabolic processes that work on rasa dhatu then produce rakta. The next dhatu to develop is mamsa which gives rise to meda. From meda comes asthi and from asthi arises majja. Shukra is the last dhatu to be created and is the most refined.

Mala
The malas are those substances which the body eliminates in the process of creating and maintaining the dhatus. They are feces, urine, sweat, mucus, tears, saliva, menses and carbondioxide. The action of the doshas separates the waste material from the dhatus at each stage of metabolism and then discharges them from the body.

Ama
When the doshas are aggravated because of poor diet, unhealthy lifestyle, negative emotions they first affect agni the body's biological fire that governs digestion and assimilation. When agni becomes weakened or disturbed food is not properly digested. The undigested, unabsorbed food particles accumulate in the gastro-intestinal tract and turn into a toxic, sticky substance called ama. This ama clogs the intestines, overflows through other bodily channels such as blood vessels and cause diseases. The presence of ama can be felt as fatigue or a feeling of heaviness. It may induce constipation, indigestion, gas, bad breath, stiffness in the body or mental confusion.

Seasons
Ayurveda classifies seasons according to their predominant dosha. The windy, cool, dry weather of autumn is largely vata; followed by dark, heavy, damp, cloudy kapha qualities of winter. Early spring is kapha but as late spring arrives the increased, warmth, light and brightness express pitta qualities which manifests fully in summer.

Yoga exercises

Kaphas
With their stronger, heavier physiques can and should do the most strenuous exercises. They are the most reluctant exercisers, preferring to do little or nothing. They must exercise strongly otherwise they will put on weight and feel emotionally heavy and dull. Jogging, cycling, tennis aerobics are great for kaphas. The important seat of kapha is the chest. Yoga exercises that stretch the pulmonary cavity and increase circulation in the chest are good. Beneficial postures are sun salutation 12 cycles done quickly, viparita karani mudra, shoulder stand, plow , locust, bridge, peacock, camel, fish, cobra, bow and circle postures. Bhastrika pranayama is good for kaphas.

Pittas
They should exercise a moderate amount. Pitta has its seat in the solar plexus and the intestines. All exercises that stretch .the chest and the abdomen are good. Fish, camel, locust, bow, circle and surya namaskara done slowly. Avoid headstand, shoulder stand and plow and all inverted postures. Shitali pranayama is good for pittas.