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[petehosk]

Tim has mentioned the subject of running gait.
I'm a fair sized unit (6'3 and over 16 stone) although no beer belly yet! And do a decent amount of running too without problems. I did have some issues but I went and got my gait analysed - they put my on a treadmill and did a camcorder at ground level behind. Then they slowed it down and could see me slightly over pronate! So they tried slightly different running shoes and did the same again, until they could see I was running with a nutural stance! And since then, I know which running shoes I need every time, and running is no worries - regularly do several mile runs without any further issues since having my gait analysed which was 6 or 7 years ago!!!
It sounds like it may be putting some strain on your ankles as your foot goes through, so find a shop which puts you on a treadmill to analyse your gait.

[Bez013]

If you want to run get your gait checked as others have said, however if you are 'heavy' for your frame I would suggest doing something with lower impact for your joints until your weight has dropped.

Try cycling as an alternative, I dislocated my ankle a few years ago and due to the inactivity I put on quite a lot of weight, I lost some of the weight when I started exercise again but running was a problem whilst I was too heavy and my ankle was still slightly weak.  I now cycle at least 4 times a week and for at least an hour each time on a very hilly route which I push myself on until I basically feel like I'm going to fall off, I've really noticed the difference recently with my weight and shape and am able to go much further in the time.

[shaqharris]

That's a good idea I use to bike all the time a few years ago but I fear cars and that so I took up running I have nevr been a great runner mind you , so maybe I should take the hint .

[petehosk]

Or another good method to try is to run outside on grass or a softer surface. But instead of jogging for as long as you can, try to jog for 1 minute, then walk for 1 minute. Then jog for 1 minute again and walk for 1 minute. And carry on repeating this for 30 minutes or for however long seems comfortable(ish)
Then over the time period of a month or two, you should slowly decrease the walking period and increase the jogging periods until you should be able to do 30 minutes without walking.
If you are comfortable and not getting the pain or soreness you are getting now then you can build on that fitness gradually if you want! But if it is too much then as bez suggested, build up by cycling and loose some excess weight first to lessen the amount of strain on your ankles