Agreed! I myself go for a walk every day and the day when i drop it just for a greed of getting a little more sleep, that day goes lethargic without any energy. The fresh morning air has something in it which makes you happy suddenly and you are filled with energy instantly, like its getting geared up for facing the day with all new vigour. A little bit of stretching and few minutes of walk has so much benefits that it also keeps your BP in check and lowers the cholesterol level.So i dont think anyone wants to miss out so much of benefits and lurk behind their bedsheets :P