The first one who told me about the 10,000 steps per day was my friend Martin. He has, almost religiously, walked that amount per day ever since I met him, sometime around 1986. It seems he was right all along:
“The first company that produced pedometers came up with the 10,000-step benchmark without any data, as that was considered an auspicious number,” says Lieberman. “Since then, plenty of studies have shown that steps a day is a reasonable way of measuring physical activity. As you increase your step count, you reap increased benefits, but it tails off between about 8,000 and 10,000.”
Hutchinson agrees: “There’s nothing magic about 10,000 steps a day, but it is pretty good advice. In general, the best target is probably ‘a little more’ than what you’re currently doing.”
Via Kottke.