Other KdF programs included concerts, opera and other forms of entertainment in factories and other workplaces, free physical education and gymnastics training and coaching in sports such as football, tennis and sailing. All this was paid for by the DAF, at a cost of 29 million Reichsmarks a year by 1937, and ultimately by the workers themselves through their dues, although the employers also contributed. KdF was one of the Nazi regime's most popular programs, and played a large part in reconciling the working class to the regime, at least before 1939.