Lots of us haven't the time, the joints or the inclination to exercize vigerously for a dozen hours a week, that is the whole point.
So9
Well, I went on a 13 mile hike today (2500 feet ascent/descent) and I was fine on just a small bag (250 cals worth) of cashews, 2 protein bars and a handful of wild huckleberries I picked on the way. Normally I would of had a breakfast of bacon/eggs but I woke up late and needed to get on the road.