Tennis

It may not get the heart-pumping press of running or cycling, but a set of well-played tennis can get your heart rate to its target zone in a matter of minutes and burn more than 500 calories in an hour. Considering that amateur players can hit the ball at about 50 miles per hour, you can also get a pretty good upper body workout. Here's how to put every minute and point to your advantage.

• Go after each ball: Whether in a game or in warmups, go after every ball — whether it's in or out. Besides getting a better aerobic workout, you'll also improve your footwork and timing.
  
  
• Fetch balls briskly: One of the biggest problems with tennis is that your target heart rate fails to stay up long enough to get a great aerobic workout, because of the delay between points. So use that "down" time effectively: Run to pick up balls between points.

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