JUMP START Story By Susan Pederson, Photography by Linda Matteson-Reynolds, Greg Howard, SeaSide Studios and Rob Bau To the untrained eye, it’s poetry in motion. Horses with names like Ziggy Stardust, Mr. Dress-up and Dejah-Vu fly over man-made jumps with the precision of well-trained gymnasts, their grace and beauty palpable as their riders lead them through this powerful ballet. To the judges, and those who lives are steeped in the world of equestrian riding, the Annual Island Classic Horse Show (July 10-13 this year) is wrought with the pressure of competition at its most challenging. With the preparation demands of…