The triangle pose is one of the 12 basic Asanas (postures) as taught by Swami Vishnu-devananda , founder of the Sivananda Yoga Vedanta Centers.
Stand up straight, and place your feet slightly more than shoulder width apart.
The Triangle is a lateral stretch for your trunk muscles and spine, and makes your hips, legs, and shoulders more flexible. Stretch your right arm up, then bend to your left, sliding your left hand down your thigh. Do not twist your body. Hold for 30 seconds, working up to 2 minutes with practice. Inhale as you straighten up again. Repeat the pose on the other side.
Your body forms a straight line, parallel to the floor. from your waist to your fingertips.