Align both feet on the floor so that each has their own separate "track" of baseboards. With feet together, your tracks should be parallel and adjacent.
Begin by stepping forward with your right foot. Place it on the same track as your left, so that you are effectively on one line. Your weight should be fully over your right foot.
Keep your upper body facing forward. There should be a moderate amount of torque in your body due to the position. Allow the release of this torque to power your turn to the left.
Turn to the left. Make sure you keep your left foot in contact with the floor. It should remain pointed and in the same spot throughout your turn.
End with weight still on your right leg and your left leg bent and crossed over your right. You may repeat this spiral turn to your right by collecting your feet and beginning with left foot forward.