Launch a web browser, such as Internet Explorer, Safari or Google Chrome. Make sure that you have the latest Adobe Flash plugin, as the video will not be able to run without it.
Visit NBC's The Biggest Loser show website, at http://www.nbc.com/the-biggest-loser. Although the episodes may be available on other websites, viewing the full episodes directly from NBC's website is free and legal and should be the method of choice for watching The Biggest Loser online.
Click on the video link in the menu bar that appears in the middle of the page and choose which video clip, sneak peak or full episode you would like to watch. This will begin an automatic stream of the video on your computer.