Some high school kids walks 4km between home and school each week day, and other school classes that makes up another 2 km each day, so that’s 6km each day times five days in a week, subtotal of 30 km in a week. Plus home time hours and weekends, another 25km, so total of around 55km for a week. 8 km in a day times 7 = 56km in a week for an old man?