If you keep repeating the steps until each skill channel has been viewed, the Sim will keep learning the three skills as he or she goes on about their daily life, and four when doing skill activities. For example, work out and both the Athletic and Cooking skills will continue to rise. As an added bonus, you can train two skill points at once. After that, the skill meter should stay above their head until you start another Cooking, Fishing, or Gardening skill activity. Allow this Sim to sit there for as long as they please until they decide to do another activity of their own. Notice that although the TV is displaying video games, the first Sim still has the skill meter above their head.
Then, have a second Sim go over and start playing video games. Switch the TV over to one of the previously mentioned channels so that the Sim can start earning his or her skill point. Have a Sim sit down and watch television. This trick requires a TV with a Cooking, Fishing, or Gardening channel and a video game system.