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I learned how to throw backhand after about 8 years of forehand-only golf. I can't throw it all that far backhand but I can throw it low and straight. I learned my backhand from a standing position and reaching back added some distance. I reach back as far as I can and I keep the disc up at shoulder height. This forces me to come through in a flat or slightly downward motion. A good extension on the pull back and a good follow through helped me.