I'm really overweight and I am tired all the time thanks to full-time job, commute and 3-year-old who doesn't sleep through yet and every diet/exercise plan I begin is too ambitious as I soon stop. Ie my swimming lasted about two weeks running one and now I have decided that walking could be the thing! Would it actually help though? Say an hour a day of brisk walking? I figure anything that gets me out and exercising has got to be a good thing.