Take a look at this!  Michael Sweeney has drawn upon his years of teaching experience to create this easy-to-use set of warm-ups designed for beginning groups.  Each of the eight short, simple exercises focuses on a specific jazz concept or scale.  The parts are easy to read, with no complicated instructions or diagrams.  The full score includes additional helpful hints for the director.  Use two or three of these at the start of each rehearsal and watch your band improve!