Very important in distance running is cardio, (especially if you haven't done it for a while), and that can be done in many ways, including stationary bike and jump rope. But I've found the most effective way to prep for a sport or event, is DOING that sport ... if you're planning to run a 5K, then prep for it with a 5K, (or work up to it over a few days with shorter distances) ... that way, your system is not shocked or unprepared in any way, and it's just "another day at the office". Prepping with other activities will work well for the cardio, but the only way to REALLY prepare yourself for something specific, is DOING it.