Again, Exercise

I know that I have to keep it up for the rest of my life, but anything to keep me walking.  Legs, abdomen, arms, neck, etc., exercise, exercise, exercise.  Imediately afterwords, it makes me dizzy, but after that it makes me feel that much better.  Some have said that their doctor has suggested not to over do it, but others have said the opposite.  The dizziness is only temporary, the positive effects of exercise last longer.