Stance

The archer stands upright in a comfortable, relaxed position with one foot each side of the shooting line. The feet should be about shoulder width apart with an even amount of weight taken on each foot and an even amount of weight between the ball and heel of each foot. This will maintain balance and help keep the body steady.
During the shooting sequence, the body position must remain as steady as possible with no shifting of weight or leaning of the body.
If there is a problem with bowstring clearance to the arm, then a open stance may be required.
Once the stance position has been established, then it must be consistent from shot to shot. Using foot markers can help maintain a consistent stance.