Too often ballet dancers are paired with flowers and satin in a pastel romanticization of what is, in truth, an uncompromising art, the most demanding on the body of all artistic pursuits. Boxers, meanwhile, are reduced to their swollen eyes, flying sweat, pooling blood and heaving torsos. But in John Goodman’s first solo exhibition in New York, he juxtaposes beautiful black and white images of both—his photographs of dancers of the Boston Ballet taken in 2004 alongside his photographs of…