Today I managed to jog on the treadmill - albeit for a couple of minutes only - but so proud of myself. Been going to gym for couple of weeks now - did little exercise before. My goal is to be able to do 10 minutes within next couple of months. Is this achieveable? Has anyone else gone from getting out of breath after a minute or 2 to being able to sustain it for longer. How long did it take to build up stamina?