The short answer to that question is yes.
The plethora of training programs you can find in books and online are filled with tempo runs, speed workouts, long runs and cross training days for a specific reason – to get you ready to run your best race.
If you start selectively picking and choosing which workouts you want to do, you could be tempting fate on race day.
Having said that, most people probably aren’t professional runners. Life can throw you a curve from time to time and that 5:00 AM run you planned to get in before work may not happen if you’re nursing a sick kid back to health, you have to unexpectedly travel for work or any other countless variable that you might encounter. The fact is, even the best laid training schedules will have to work around other events in your life from time to time.
So what happens when life gets in the way and you miss a workout?