Vrksa means a tree.

Technique

Stand in Tadasana

Bend the right leg at the knee and place the right heel at the root of
the left thigh. Rest the foot on the left thigh, toes pointing downwards.
3· Balance on the left leg, join the palms and raise the arms straight
over the head.
4· Stay for a few seconds in the pose breathing deeply. Then lower the
arms and separate the palms, straighten the right leg and stand again in
Tadasana .
.
5· Repeat the pose, standing on the right leg, placing the left heel at the
root of the right thigh. Stay for the same length of time on both sides,
come back to Tadasana and relax.

Effects

The pose tones the leg muscles and gives one a sense of balance and
pose.