eh, my cyclocomputer tracks them for me. It's not that hard, I ride 6.5 hilly miles each way each day.
I used to ride 2.5 flat miles each way each day.
Eventually I'll start riding more.

Right now I'm working up to a baseline of health and biking ability, then I'm going to start training to do a century, so knowing how far I'm going in how much time will eventually be important. for now, the most usefull thing on my cyclocomputer is the clock

-- James