Half Tree pose

Stand erect, keeping feet together. Place hands beside body. Raise right leg without bending the knee and keep the right foot in the side just above the left knee.The sole of the right foot should be upper
  and toes pointing down. Simultaneously raise both the hands over the head and place in namaskar mudra. Balance on left leg , stand straight breathing normally. Increase the time of standing on each
leg during practice. Return to the starting position and change on to the other leg.
Benefits
Keeps one  alert, conscious and balanced.