Add in a Few Quick Bursts : The easiest way you can exercise more in 2013 is to incorporate quick workouts into your already-established fitness routine. A short series is perfect for your days off from the gym or as a burst of cardio in the morning before you start the day.
This is more profound that it initially seems. How many of us work ourselves into a bad mood thinking about how much fitter we ought to be rather than expending the energy doing some bodyweight exercises or just moving around? (Guilty as charged.)