Every once in a while when I am out on my 6 mile daily routine I see some really big person, probably 100+ pounds overweight trying to run. This has got to be the dumbest idea ever. At that kind of weight you can easily burn the hell out of calories by simply walking and adhering to a simple normal calorie intake (ignore this if you lift weights). For men that is about 2,500 calories a day. When I was super heavy all I did was walk. No jogging, no running. I ate what I wanted (though I did try to avoid consuming more than 100 carbs in a day), but I just stuck to a simple 2,200 calorie plan. I lost what doctors would describe as a very unhealthy amount of weight per week; about 3 pounds. This wasn't short term either, this was over 6 months - nearly consistently. These people are setting themselves up for failure and and at the same time destroying their joints and inducing what I can only imagine are terrible shin splints. Or am I missing something? From everything I've read (regarding fat people only) there is NO great benefit to running over walking when you are very heavy, especially in regards to heart rate zones. I did a fair amount of reading as a fat person looking to get healthy without killing myself.