Keep your left foot leg still, slight bend in knee, pointing straight to the direction, you want to cast, always with a good footing, if those rocks were wet you will slipping around, doing some damage, to you and tackle. Right foot about 90 degrees, again good foot hold, slight bend in knee, and move your body, rotating your body for the cast, push with your right, pull with your left, arms, again look up to a 45 degree and direction you want to cast.