Our expert says:
Well, diet is more effective than exercise for weight loss. So my advice is to consult first with a dietician, and then consider exercise (which is equally vital, for many other areas).
Then when you start exercise, which as I say is a really good thing, it's cardio, and your doctor is quite right, you need to just be careful, start easy. There are a number of programmes at this website: http://www.health24.com/fitness/Programmes/16-1347.asp
The walking programme would be a good starting point for you, that's where I'd pick it up. Do all this in consultation with a doctor - first prize, actually, is to work with a biokineticist, who can supervise the training, because you do have a risk factor and that's always advisable when on medication!
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