Good god... I don't see how people can run that far! I'm 50, 5'8", and 124 lbs (I think I may have gained some breast weight and in the legs since I started cycling my regimen). I limit myself to running short sets (like about 50 yards at a time), about ten times, and walking in between during the 2 miles round-trip each day. Of course, I've been fairly sedentary over my life, especially in the last year where I'm home all day and read all day, and I make myself go outside to get something out of the garden or water it, or to walk to the main road to check the mail. I'm the only runner out here in my area. Nobody in my host's family runs out here. It is DEADLY for people out here in SE Texas. Not only do people eat badly, they don't even exercise! Who wants to in this humidity and heat?? Fortunately for me, I live outside of the city where it's always fairly cool in the morning because of existing vegetation and trees. I feel like I need to exercise to maintain some level of fitness, but to minimize wear and tear on my body as well.