Walking

When I last saw my doctor and proudly reported that I walked my dog 10-15 minutes a day, old Doc Nay raised his eyebrows and said, "If you upped that to 45 minutes a day, you'd get greater benefits."
(What, was he calling me FAT?)
Obedient girl that I am, I experimented with using my walky thing that sits in the living room (I don't know it's official name...see teeny tiny photo below)

or walking on the streets of my town. What I have learned is that if you walk on a walky thing in your living room, it's very easy to step off "just for a minute" to go get something to cool you down... say, a dish of ice cream... and then answer the phone and run to the post office before it closes and deal with a child's emergency and ultimately fall into bed without getting back on the walky thing.
On the other hand, when you walk on the street a certain distance from home, there is no alternative but to walk that same distance back in order to reach the freezer and bowl and spoon, thus getting in the desired walking time.
This means something profound. It could be that you've just got to get yourself far away and then write yourself home.
What do you dedicate yourself to completing? How do you reach your goal?