For many of us, buying things over the Internet is a bit scary and intimidating. This is even more the case when you're buying a large item, even if you know and understand what you're buying. If you don't know very much at all about what you're buying, then it's probably worth taking a different approach to your usual procedure for buying online. Some physical research is a good idea, to make sure you get the very best deal for your money.
If you're interested in buying a treadmill, take the time to read various treadmill reviews online so that you have an idea which models are the ones you're most interested in buying. Write down the names and models, and hang onto it. Now go for a drive to your nearest treadmill retailer, and have a wander around. See if they sell the makes and models you have on your list. Quite often you won't be able to find exactly the same model, because manufacturers regularly update their products, but see if you can find a similar model they've released.
Now comes the fun part - get on the treadmill and have a go! You need to get a feel for how that model works and feels. It's important that the treadmill feels comfortable and safe, because chances are all the treadmills made by that manufacturer will be made with the same customization and precision. Write a few notes against that model on your list, and check for any extra features such as calorie counters or a heart rate monitor. Is there a particular feature that you find particularly impressive? Jot it down. Once you've tried out any treadmills on your list, or their closest available model, you can head back home again. If any salespeople come up to you, just let them know that you're doing some preliminary research and aren't ready to buy just yet.
Once you get home, you can check your physical notes and compares them to the treadmills you'd found online. Make sure you record any features that you particularly like, as they could make a big difference to your enjoyment and usage of the treadmill. Now you can do some shopping, to find the best prices and options available. Make sure you check out more than one online store, as they all have different offers.