"Every day you may make progress. Every step may be fruitful. Yet there will stretch out before you an ever-lengthening, ever-ascending, ever-improving path. You know you will never get to the end of the journey. But this, so far from discouraging, only adds to the joy and glory of the climb. "
Sir Winston Churchill
PR--Personal record. Few of us will ever set a world or national record, but anybody can establish a PR. Any time you've recorded a time over any distance (even odd distances in training), it becomes your PR. Every time you run that course or distance, you will have an opportunity to better that PR. Going after PRs can be fun; most important, it can be motivational.
When Rachel ran the 1/2 marathon on Sunday, she set a new PR.