According to Ayurveda being overweight is an indication that the vata, kapha and pitta doshas in the body are out of balance. In obese persons, meda (fat) is nourished excessively, while other basic elements get malnourished. Lack of physical exercise, sleeping during daytime, consuming fatty and sweetened food items and the wrong diet and lifestyles, which increase Kapha are the common causes of obesity. Yoga has  a effect, which is permanent in nature for weight reduction. It helps achieve control over mind and behaviour(one can easily control food habits and change life style to reduce the obesity.) Yoga deep breathing helps in increasing the oxygen intake to the fat cells resulting in burning up of fat cells. Another amazing aspect of Yoga is it reduces anxiety, which reduces anxious eating. 

Various Yoga techniques can be practiced effectively to reduce the weight and achieve healthy condition of Body and Mind, they are:

Asanas

Yoga positions or postures are useful to reduce the fats in various parts, especially forward bending, twisting and backward bending asanas help reduce the fats near abdomen, hips and other areas.

Sun salutations

The practice of Sun salutation is a sequence of seven asanas practiced in order, which tones all muscles and internal organs are stretched increasing blood & oxygen supply to these parts. Regular practice of sun salutation with breathing gives good exercise to the lungs. Mantras have relaxing effect on mind.

Pranayama

Pranayama is very important technique in yoga, which is control and extension of Prana or Vital energy/Life force. People suffering from obesity can practice Kapalbhati, Bhasrika & fast breathing.

Agnisar

Fast movement of abdominal muscles in and out, is very good exercise to get rid of the accumulated fats in the abdominal region.