What's the most popular cardiovascular workout? According to research conducted by American Sports Data, Inc., it's treadmill exercise, with more than 37 million participants in 1999. That's up a whopping 743 percent from 1987.

No wonder so many people have taken to exercising on treadmills - it's an excellent way to lose weight and get in great cardiovascular shape. If you're in the market for a home treadmill, you've got a wide variety or products available from which to choose. It's very important, however, to find a treadmill that will meet your needs and help you achieve your goals, so be sure ask the following before going shopping:

• How much money do you want to spend? The old saying, "You get what you pay for," directly applies to home fitness equipment. While it may be tempting to take advantage of a good deal, an inferior piece of equipment won't deliver the results you want, and it won't be as sturdy, dependable or enjoyable to use. Consider this purchase an investment - a good treadmill will last you for years.
• Who's going to use the treadmill? The size and weight of the user, as well as how he or she plans to use it, e.g., walking or training for a marathon, can make a difference in the kind of treadmill you purchase. Also consider the number of people who will be using it. A treadmill's durability becomes increasingly important if several people will be logging time and miles on it.
• Where will you keep the treadmill? Shopping for a home treadmill is like shopping for a sofa; figure out in advance where you plan to place it and measure the space. You want to be sure your treadmill will fit where you plan to exercise.

Now you're ready to put on your running shoes and head to the store. Here are some tips to help you select your treadmill:

• Go to an authorized specialty fitness equipment store. You'll find higher quality products and greater selection at specialty fitness equipment shops such, as Fitness Unlimited and L.A. Gym, rather than at general sporting goods stores or department stores. Specialty stores also typically have certified fitness professionals who can help with selecting, understanding the features of and maintaining your treadmill.
• Try out several treadmills. It's important to test different models of treadmills before making your final choice. If the machine doesn't feel comfortable to you, you won't use it, so wear your shoes and shorts and plan on giving a number of treadmills a five-minute try. Look for sturdy construction including a wide and flexible running surface, an easy-to read console and a variety of programming options, including those that let you get going quickly or that let you customize and personalize your workouts.
• Check out the exercise programs. While most treadmills have adjustable inclines and speed settings, the range of programming options run the gamut from basic fat burning and cardio workouts to far more elaborate programming, such as the Life Fitness Sports Training Workouts, which simulate outside terrain with both 5K and 10K race courses, available on Life Fitness' newest treadmills.
• Find out about warranties. Don't forget to ask about parts and services warranties. The most reputable manufacturers back their equipment with good warranties.

Once your treadmill is in place, resolve to use it regularly, and before long you'll agree with the millions of others who exercise on treadmills - it's a fabulous workout.