Do you really need to take 10,000 steps a day to keep fit?
https://www.bbc.com/news/magazine-33154510

Stop Walking the 10,000 Steps!
When did this 10,000 figure originate and why? Way back in the 1960s a Japanese company was trying to sell pedometers. 10,000 became the number for its extremely successful marketing campaign.
https://www.healthcentral.com/article/stop-walking-the-10000-steps

Will 10,000 Steps a Day Make You Fit?
https://fitness.mercola.com/sites/fitness/archive/2015/07/03/walking-10000-steps-daily.aspx