The effects of this pose are amazing. Holding Trikonasana for about 30 seconds each side actives the spine keeping it supple and long and can improve the posture. Space is created between the vertebrae and discs in the Spine with this gentle lateral flexion/twisting action. Muscles are stretched and contracted evenly. It’s very beneficial for the legs, hips, back and chest. The lymphatic system is able to drain in this pose. The pressure of the squeeze/soak on the diaphragm is also assisting the movement of lymphatic fluids, as the major lymphatic organs (the spleen & the thymus) are based around the thoracic spine area, behind the diaphragm. The twisting action is beneficial to releasing any toxins from the lymphatic system.

(picture found on universoyoga.wordpress.com)