A Study revealed that the popular notion of healthy 10,000 steps a day isn't as beneficial as it was believed to be. 
The study researched its origins, which turned out to be a marketing gimmick for the 1964 Tokyo Olympics. The researchers studied the differences between 10,000 steps and Active 10 (three 10-minute speedy walks a day) and found that Active 10 was more beneficial
ENG: It's all a question of adaptation. At very low stress levels one should not be surprised that there are no positive health effects.
GER: Es ist alles eine Frage der Adaptation. Bei sehr niedrigen Belastungsintensitäten muss man sich nicht wundern, dass es keine positiven gesundheitlichen Effekte gibt.