THE RIGHT WARM-UP should do two things: loosen muscles and tendons to increase the range of motion of various joints, and literally warm up the body.Bouncy flexible movements are better than those long held stretches that have been in vogue for so long.
Making music begins with physical activity. Paying attention to that foundation can yield great rewards. Taking a few moments to prepare physically and mentally is a good place to start. One reason I so like the Epstein PDF mentioned below is that he pays attention to the idea of preparation before playing.