2 miles a day....

ok, so i have walked, either on the road or on the treadmill....2 miles a day for quite some time now......and while my stamina has improved greatly, the more desirable results have been more subtle......almost negligible.....so much so that it has been suggested that i might want to boost my mileage.....the implication made that 2 miles is a paltry sum and hardly worth mentioning as an exercise regime....so much for support!?......does this count under the for better or for worse part .....the in sickness or in health part.........or was this issue covered in the words left out of the traditional vows?........