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Using a 2'6" vertical. Draw a 3' square on the ground centered in front of the jump (use chalk, stick, whatever). This box is the represents the optimum take off point for a 2'6" vertical. Practise cantering circles. Ride up to the Jump with the goa of placing the horse's rear quarters in the box at the point of takeoff.
As your accuracy improves, work on evening and steadying your pace on the approach. Use this box only as an outline or a guide as to the progress and development of training your natural eye!