>I don't get what system in our brain causes so much resistance to new obviously rewarding habits. Easy. Before agriculture, calories were hard to come by. If

>I don't get what system in our brain causes so much resistance to new obviously rewarding habits. Easy. Before agriculture, calories were hard to come by. If you ran around for no good reason, that meant you wouldn't have enough energy to catch whatever animal was nearby when you needed food and you'd die. Death by hunger was a much more real threat than death by sedentary lifestyle when evolution was wiring all our circuits up.