~1 i wleI Ht MICH1IGA'~N LDAILY Sunday, April I 20, 197- 'Heads-up' training PHOTOS by PAULINE LUBENS san boxz or group maneuvering. The superb few are caught up in the competitive chal- lenge of deftly working prevailing winds to serve their own ends, herding them home to a 25 ft. target at the end of a two-mile trek. Ask any two divers and you'll get two different reasons for their fixation on the sport of last resort. But the divers are forever bound by a common desire to revel in a solitary quiescence that the earthbound could never fathom; bound, too, by a common experience of taking risks and having those risks rewarded by an envigorating, if short-lived, escape from man's appointed realm. Skydiving . . . take the plunge, and make the world your sandbox. Chute packing: It takes two "From green-skinned novices to thousand-jump vets, all skydivers share an urge to surmount a formidable natural fear to reach unnatural heights of exhilara- tion and serenity.' The rise before the fall