How can I improve my bunker play?

Now with a ball  - The third circle happens to have a ball on it, so use the first two circles to practise technique before trying for real.

- Katie Dawkins

Draw a set of traffic lights (three large fried egg-sized circles) in the sand and position the ball opposite the inside of your front foot. You are going to address the back of the bottom circle on your traffic lights, as you would do if a ball were nestled in the centre of it. The whole plan is to eradicate the entire circle in the sand with a lovely positive swing. Get through to the finish and set up to the second circle. Repeat the same positive action

Ball position 

Have the ball a bit forward of centre - you want the left shoulder to drive the stroke, and a slight lean of the shaft will help to encourage that.