Many people aim for a daily goal of 10,000 steps (or about 5 miles)—and an industry of fitness tracking devices has emerged to support them—but that magic number didn’t originate from scientific research, says John Schuna Jr., Ph.D., assistant professor of kinesiology at Oregon State College of Public Health. “It was first used in a Japanese marketing effort associated with one of the first commercial pedometers.” The device was called “manpo-kei,” which literally means "10,000 steps meter" in Japanese. 
The best way to lose weight is to improve your diet and exercise more at the same time. If you’re overweight and want to shift some excess pounds, it's easy to fall into the trap of extreme dieting or exercise to lose weight. But either will be hard to stick to and can be bad for your health. With an extreme diet, you might not get the nutrients your body needs to function and with extreme exercise, you can get injured. What's important is to set yourself some realistic, achievable targets.
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