This is the summary of a recent study. (from Dr Karan’s newsletter if anyone follows him)
The world's largest study has shown the more you walk, the lower your risk of death (obviously..I guess), even if you walker fewer than 5,000 steps!
The study, published in the European Journal of Preventive Cardiology , found that walking at least 3967 steps a day started to reduce the risk of dying from any cause, and 2337 steps a day reduced the risk of dying from diseases of the heart and blood vessels (cardiovascular disease).
However, the new analysis of 226,889 people from 17 different studies around the world has shown that the risk of dying from any cause or from cardiovascular disease decreases significantly with every 500 to 1000 extra steps you walk.
An increase of 1000 steps a day was associated with a 15% reduction in the risk of dying from any cause, and an increase of 500 steps a day was associated with a 7% reduction in dying from cardiovascular disease.
Additionally it was noted that even if people walked as many as 20,000 steps a day, the health benefits continued to increase. They have not found an upper limit yet.
Clearly as an "observational" study (not randomised), limitations include that it cannot prove that increased step counts cause the reduction in the risk of death, only that it is associated with it.
10k steps is a great arbitrary number to aim for...sure but don't let the failure of hitting this number discourage you from movement altogether.
There is a human tendency to disregard the whole after a failure of a component. E.g you eat some "junk" food and break your diet, it is tempting to throw your diet out for the entire day and consume whatever you want.
TL;DR - walk as much as you can, as often as you can even if it's shy of the magical "10K target". There is likely no harm and only things to gain from a health perspective.
So that’s for all the 10k steps is a marketing ploy/conspiracy lot who are no doubt the same people who think BMI is pointless, cos bodybuilders (like anyone every got confused between a bodybuilder and someone who is just plain old obese)