Vajra Asana (Sitting Posture) -
Bend the legs backwards and sit with the help of your knees.
Stretch the legs towards the back and both toes should touch each other.
Keep the heels apart and let buttocks rest on heels, or let them lie in between the heels.
The waist neck and spine should be in a straight line. Rest both your hands on the knees and keep the elbows straight.
Look towards front, breathe normally.
If you breathe only into your stomach(not lungs) and allow that hot air from stomach to circulate throughout your body for a minute, it helps in reducing fat and removes all toxics from body.
Those having gas problems should perform this asana, immediately after a meal.
It provides relief from sciatic pain.
Also, the diamond pose (Vajrasana) is very beneficial in curing the problem of varicose veins.
This pose give longevity and strengthens the spine.