Like IP, I did my knee in and put on a fair few pounds. Regular games of footy; training, 5-a-side, matches on Sundays and some Saturdays if I can be arsed, maintain the weight I'm at now. But in order to get the weight off after a long lay off I used 'sprint training' at the gym once I was able to put my full weight back on my knee and run.
If you haven't done sprint training I'd advise it. It's great for burning off calories/fat and also for recovery times. Example I did on a treadmill:
1) 5 min jog at about 6.5mph
2) 1 min run at 9mph
3) 1.5 mins walk at 4mph
4) 1 min run at 11mph
5) 1.5mins walk at 4mph
Then repeat steps 2-5 another three times. In essence you're getting a full cardio workout in 20-25 minutes. This also breaks up the monotony of continuous jogging and because your heart rate is increased with the fast runs and then the walking time used to get your breath back, your heart is subjected to different levels of work-rate, which improves the speed you recover from being out of breath and ready to sprint again.
I gradually built up the amount of times I'd repeat steps 2-5 so that I was doing the walk/run cylcle 8 times in total. Then eventually, rather than add more walk/run cycles I increased the walking speed from 4mph to 4.5mph, then 5mph until I was eventually able to eliminate walking from the sprint training completely and jog at 6mph for my 'recovery minute and a half'.
If you don't have access to a gym or a tredmill you can use a stopwatch for timing the fast and slow parts of the exercise. Or if you have a running track or football field nearby, then you can use the running track to sprint 100m, walk 200m, sprint 100m, walk 200m, etc.
Or if you use the footy field, sprint the byline, walk the touchline, sprint the byline, walk the touchline. When you feel fitter, sprint the byline, walk to the halfway line, sprint across the half way line, walk the touchline to the byline, sprint the byline.
Its great for weight loss, stamina and recovery time