Just get on the bike and go. I rode this morning with 10 mile planned but as the ride progressess, I was possessed with the urge to add 5 more miles to make it 15 then 20 then 25 and finally finished with 31 miles. A short ride to me does not require bringing the trunk bag, wearing non cycling outfit and bringing only 1 pint of water. It was a nice morning to ride with perfect temperature of 59 degrees at the start.