Professional sports, as opposed to amateur sports, are those in which athletes receive payment for their performance. While men have competed as professional athletes throughout much of modern history, only recently has it become common for women to have the opportunity to become professional athletes. Professional athleticism has come to the fore through a combination of developments. Mass media and increased leisure have brought larger audiences, so that sports organizations or teams can command large incomes. As a result, more sportspeople can afford to make athleticism their primary career, devoting the training time necessary to increase skill, physical condition and experience to modern levels of achievement. This proficiency has also helped boost the popularity of sports.