Amateur radio operators are also known as radio amateurs or hams. Barkley enjoys teaching boxing skills to young amateurs. Footballers are mostly amateurs or semi professionals. Studies have also found that crowds are not simply collections of amateurs or hobbyists. He also began playing games for the Sussex Young Amateurs and Junior Marletts. Today, it is extremely popular among grandmasters and amateurs alike. Many SETI League members are licensed radio amateurs and microwave experimenters. Painting is the preferred artistic expression in Japan, practiced by amateurs and professionals alike. There are several notable theatrical companies and thousands of professional actors and amateurs. The variety of processes and equipment allows for numerous uses by amateurs and professionals alike. He benefited from the right to compete against professionals as well as amateurs. The event offered classes for both amateurs and professionals. A number of unofficial events were held for both amateurs and professionals. There is difficulty in labeling the "trobairitz" as either amateurs or professionals. This led to disputes over the balance between amateurs and professionals.