Hello everybody, first off to start I'm a 6 foot 315lbs male with one lung due to having it removed because of cancer which makes it hard to do any type of cardio. I play softball twice a week but I know it's not that much of a workout. So with that said I'm looking for tips to reach my goals which are, to lose at least 20 lbs by November, get my arms solid and build up my stamina. Any info on simple nutrition changes and workout routines will be appreciated. Thanks