Yoga asanas can be divided into five categories, and each category or asanas in that category have different type of impact into our bodies.
1. Standing asanas
Standing poses create solid foundation not only to the asana in question but also to the entire practice. These poses are ideal to warm up the body, they open the hips, strengthen, increase endurance and improve balance. Standing poses increase strength and flexibility at the same time. Above all this they improve circulation, digestion and stimulate cardiovascular system. They are also excellent for improving focus and relaxing the mind.
Asanas in this category are ideal to draw our senses inward away from the world around us. Forward bends have relaxing effect on to our bodies. If you suffer from stress, anxiety, insomnia or headaches these types of asanas are especially for you.
Forward bends stimulate spinal nerves and improve circulation and by doing they nourish the spinal cord. These asanas strengthen your thighs and this will help you find a correct alignment of your spine.
While doing forward bends you are creating pressure to our abdominal organs, liver, spleen and intestines and this pressure is like an internal massage to your organs and it improves the digestion. This also improves the blood flow along the spine providing oxygen to the brain. Forward bends also lower the blood pressure.
With backbends you can strengthen and stretch the front side of the body. They stretch and tone the abdominals and strengthen the legs, especially thighs. Backbends are rejuvenating and they increase the energy within the body, so in case you feel tired or depressed these asanas are ideal for you.
Backbends are strongly stimulating the digestive system, respiratory system, nervous system and circulatory system. In case your are suffering from asthma, backbendings can be really beneficial for you, since they open the chest and diaphragm.