Hyzer is the angle that you release the disc at. As your arm is coming forward, you want to release the disc at a 45 degree angle (angled downward) to the ground, this allows the disc to level out in flight for a longer throw and it allows the thrower to get more power into the throw for nice, long graceful throws. Anhyzer is the exact opposite where the disc is released up high, above your shoulder, at about a 135 degree angle to the ground. Anyyzer is more suited to disc golf sports, where the thrower may need to get around obstacles. The FDDO series is currently the only disc dog event with obstacles.