PLUS:Hal Higdon's 15k--Advanced: The following 15-K schedule is for Advanced runners: individuals who compete regularly in races that distance or beyond and who want to improve their performances. You should be capable of running 30 to 60 minutes a day, five to seven days a week and have a basic understanding of how to do speedwork. If that sounds like too much training, and this is your first 15-K race, you might be more comfortable using one of the programs designed for Novice or Intermediate runners. Each day, I will send you an email telling you what to run and also offering tips about training. For more information and directions, visit my website: halhigdon.com.