Our lifestyle, and not our body, evolved so fast to computers, cars, grocery stores and the internet. We are not running away anymore from predators and hunt in order to live, instead, we work to pay the bills. Unfortunately, our body is still in the active, primitive mode, that's why we need to exercise.
There are a lot of things to do in order to increase your caloriec expenditure: use the stairs instead of the elevator, park your car away from your office in order to walk and all of those good things you've heard before. Mine is simple, I use the bike going to my laboratory and if i use the bus, I walk two blocks to the next bus stop.
My preciuos bike in the middle
of high tech research instruments