If you run a marathon , you 'll easily total more than 50,000 steps in a day .
If you 're sitting at a desk for hours at a time , you may have trouble getting 4,000 .
If you run a marathon , you 'll easily total more than 50,000 steps in a day , but if you 're sitting at a desk for hours at a time , you may have trouble getting 4,000 .