How to get in shape without trying? Ditch your car.
These last 6 months I have put in more bike miles than the previous decade. All it took was my timing belt's impromptu demise and my integral Intergra was no longer my chariot. The clock had struck midnight as we drove on the 150. Combine no car with a nice mountain bike and increased bike activity becomes the norm. We find our self in a decent level of shape without even trying. Now, just add several fun trails - many less than 4 miles from your doorstep - to the equation. Suddenly, you realize the inaccessible trails are now not just accessible - they are rocking and you are rolling. Funner than just about anything. The key to making this your reality: consistency - bike nearly every day and recuperate. Take a day or two off. Rest. Relax. Enjoy the norepinephrine reuptake inhibitors while they last then got your ass back out there.