Some people, when confronted with a problem with their fitness levels, think "I know, I'll install some iPhone apps." Now they have two problems.<p>(I couldn't resist that one. )<p>That said, it's absolutely a great idea to track your exercise program. I go the dinosaur route and use emacs to edit a file called "exercise.org". Once your plan is laid out, it's very easy to push yourself <i>each workout</i> by marginally increasing things each session (or every two sessions, or whatever).<p>Even more importantly, careful notes help you notice patterns. I recently observed that deadlift -> lower back pain.