In answer to your questions Samsara - I started excercising 2 weeks after the surgery but just walking, and then worked my way up to running. I now run 2kms 2-3 times a week and try to get to the gym on average 5 times a week. Where the gym is concerned I am concentrating more on muscle definition than fat burning, as the weight is coming off so want to try and build some muscle to replace the fat as I lose it if that makes sense... I spend about an hour and a half on a gym weight session, and excercise each muscle group in turn. I am tending to concentrate more on my legs at the moment as they have always been big in proportion to the rest of me, and my instructor says only way to shape them is with some muscle definition.
If you are alone also Samsara, then you really will find this forum invaluable. You will find that the people here understand what you are going through, and will offer advice and support - laugh with you when things are going right, and cry with you when it all seems like it is going wrong... I know one thing for sure!! and that is that the bypass is the best thing that ever happened to me, even with all the ups and downs, and I am sure it will be the same for you xxx