Circling is similar to stroking in its soothing effect. Both palms are used in just the same way, but as they strokethey move in circles, one clockwise and the other anti clockwise. Sometimes, on large areas of muscle, circling is done more firmly with one hand placed over the other and two hands together making a single circling movement.
You can also use both hands to make one big sweeping circle, with each hand completing one half of the circle.