Just done it. The dog was behind me for 3/4 and then got her second wind and was leading. Went passed the finishing post like a train. had to tie her up while I took a breather (measured my pulse).
If I change my sex I move up to Good but as that is not possible I have two other choices. If I lose 10lbs then that in no good but if I improve by a minute then I move up a grade.
The answer is for couch potatoes to move faster and not lose weight!