The Scots later formed a variant of this style, and the Irish developed the "collar-and-elbow" style which later found its way into the United States.[8] A Frenchman[n 1] "is generally credited with reorganizing European loose wrestling into a professional sport", Greco-Roman wrestling.[9] This style which was finalized by the 19th century and by then, wrestling was featured in many fairs and festivals in Europe.[10] Greco-Roman wrestling and contemporary freestyle wrestling were soon regulated in formal competitions, in part resulting from the rise of gymnasiums and athletic clubs.