Started a diet within the last few days and it's going well. have lost a few lbs. I am 16st 7lbs but actually don't look it. I'm male, 22 and 5ft 11. everyone guesses that my weight is about 14stone, strange. I think I hold most of my fat/weight in my chest and want to lose it. So my question is, how long should I run/jog for. This will be my first real bout of exercise.