If you can; put SparkPeople app on your mobile/cell. When you work out you can log your activities as you go along. If for some reason your app doesn't work due to bad signal, use a notepad on your phone and record your results and put in calorie, time and distance results.
This helps me keep track on how much fitness I've done for the week and how much I need to do ahead of my next goal.
It's especially brilliant when I go to the gym as I can listen to my music and log stuff down on my BlackBerry at the same time.