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Prefix: biweekly, inactive, return, uncertain

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What is this article mainly about?

A.The goal of taking 10,000 steps is popular but is not based on research
B.The marketing campaigns that were launched for the 1964 Tokyo Olympics
C.The use of Japanese characters in marketing gimmicks for fitness devices
D.The idea that teenagers enjoy tracking 10,000 steps a day as a fun activity

To determine the main topic of the article, we would need to see the full text or a brief summary. Without that information, we cannot accurately determine the main topic.

the article:

The idea that people should aim for 10,000 steps daily for ideal health has been around for a while. That's about a 5-mile (8-kilometer) walk for most teens and adults. The 10,000 steps goal is widely recommended by fitness experts. So, that number must be based on lots of research, right? Nope!

The magic number actually came from a marketing campaign that launched just before the 1964 Tokyo Olympic Games.

At the time, a Japanese company started selling a device called Manpo-kei, which means "10,000 steps meter." The name wasn't based on any research data about the health benefits of taking 10,000 steps daily. Instead, experts say, it was just a marketing gimmick. The number was likely chosen because the Japanese character for "10,000" resembles a man walking. Even without scientific research, this number caught on around the globe, and other fitness trackers started using it. Decades later, getting 10,000 steps in daily is fixed in many people's minds as a key to better health. But should it be?

Maybe—or maybe not.

Getting enough exercise is, of course, important. But some experts warn that the 10,000-step goal can be unfavorable. The number can seem too high to achieve every day. Failing to reach it can make people unhappy—so unhappy that they might give up on improving their fitness habits entirely. A study of teenagers showed that they enjoyed having a 10,000-step target. But they became discouraged when they were unable to reach this goal regularly.

Another study showed that people disliked when they had to track steps—they said it felt like work rather than a fun activity. So, what should people do to stay healthy? Experts say to track your steps if doing so provides positive motivation. However, keep in mind there's not actually a certain number of steps that you need to take every day. Just find time to get moving as often as you can.