Question: is walking 40 miles a week good for you?
Answer: For every person who is over-exercising, there are 19 people not getting enough exercise, O'Keefe said. Running about 15 to 20 miles a week provides optimal health benefits, O'Keefe said. Or walking can provide benefits, from 2 miles a day to as much as 40 miles a week. ... Moderate exercise is.”