About as close as I get to a log is for the days I commute. I have a large dry erase year at a glance calendar on my office wall. On the days I commute I put a black triangle on the corner of that day. The triangles are easy to see and make me feel good about riding. That is it. On all of my other rides I log absolutely nothing and still feel good about it. Now that one of my bikes doesn't even have a computer I have lost track of my mileage for the year. I will probably put a computer on it just so I will know my annual mileage.