I hope for you and your family's sake you switch to a balanced diet.
You need to very gradually ease yourself into running - at your size you could get injured very easily and be forced to give it up.
Go and get yourself a bike, cycling is overlooked by many people when they decide to make lifestyle changes. I don't know why because it is much more appropriate as a starting point for someone who is heavy and unfit.
I tried twice, unsuccessfully, to get fit and healthy through running alone. Then I started cycling 2 years ago, lost a ton of weight and now enjoy my running more than ever - new parkrun PB of 21.30 today
Everyone warned me about how difficult the bike-run transition would be but I haven't found this at all.
Personally, I'm really struggling on the bike (my strongest discipline by a mile) after just 10 minutes in the pool. Feel massively down on power and can't work out how such a short swim does this to me..
I wasn't really doing any structured training as such, just going out 3 or so times a week and trying to improve. I'd previously been more into longer distance running, but realised that I was better over shorter distances.
Luckily my new local run is flat/paved. Yours sounds similar to the Havant one I did a couple of times - absolutely killed me owing to not anticipating the terrain/hills as you say. Did it around 2 minutes slower than usual as I recall.
Thanks for the replies. Perhaps I should report progress back..
Charlie, it's good to hear you've progressed so quickly in a similar position. I'd say it was around April last year I was running 21 mins. Note your comments about alternating some weeks; I've always been all or nothing to be honest and tend to try to maintain a set pace, so perhaps I'll give this ago
I was wondering whether anyone might have some advice for me on this subject.
Last night I went out for the first time in over a year and completed a 5k route in around 27 mins, I used to run it in 21.
I'm interested in joining in with the recently established local park run (part reason for the re-invigoration) and wondered whether I could realistically look to improve simply by covering the distance at max effort every Saturday morning, with maybe a slower and more enjoyable 10k run in the week.
I have no doubt that the first 4-5 minutes will drop off quickly but fear I might plateau once I get close to my PB. I find it really hard to motivate myself for fast training runs; much preferring longer distances at an easier pace and saving my best for when there're other runners around me...