In modern day society too much time is often spent up in our heads, and our body gets neglected. We were designed to move and interact within nature as a whole system, with no separation of the mind or body. By sitting for endless hours we are allowing our body to deteriorate and limiting the brain from increased amounts of oxygen and blood flow that results from even 10-15 minutes of exercise.
The key is finding the things that you love doing so engaging the muscles in rigorous activity does not require any effort. If it is fun and challenging you forget about the workout that is occurring and instead look forward to the next opportunity to get an endorphin high.