When I first started boxing I tried the famous couch to 5K program (C25K). After the first couple of weeks I found it impossibly hard and after speaking to a running coach (probably should have done that rather that using the Internet), the reason became clear. The C25K ramps up too fast for fatties, hell the running sections increase 50% from week 1 to week 2!
The advice given to me was to start with a 10 minute run. If you can't run 10 mins you need to start with some other cardio and build up to a 10 minute run. Try to run 3 times a week, it's only 10 mins, I do it while the oven is heating up. Then every 2 weeks (or whenever you feel comfortable) increase the run by 2 mins. Once you reach 20 mins, confidence begins to increase and you are able to make larger increases. Tadda!! How to run if your a fattie.
It works! Today I increased to 12 mins and I bet I'll be telling you about 14 mins in two weeks. Mark my words
TTF