Many runners start running for exercise and fitness, then begin looking for bigger challenges. Road racing is one such challenge. Many runners choose the 5K or 5 kilometer (3.1 miles) distance for their first race. It is long enough to provide a challenge but not so long that it is unattainable by beginning runners.
You need to be properly trained to finish the distance. Without proper training, you are likely to either not finish or finish too exhausted to enjoy it. With proper training you will finish the race easily and have fun.
For runners who like structure and schedules, there are many 5K training programs with detailed training schedules. Many runners, however, do not like detailed training schedules. Perhaps the rest of their life is overscheduled, or perhaps they just prefer to be spontaneous. These runners may prefer an unstructured training program.
The unstructured 5K training program below applies the common principles important to training for a 5K race. However, rather than provide a daily or weekly training schedule, this program allows individual runners the flexibility to work their training around the rest of their lives. The program is primarily for runners doing their first 5K, rather than experienced racers.
Increase mileage slowly. Neither the length of your longest run nor your total weekly mileage should increase by more than 10% a week. Work up to the point that you can complete about 3 miles, if your only goal is to finish. If you want to improve your time or get a good time, the longer runs should be up to 4 or 5 miles.
Don't run the same distance every day. Take longer runs 1 or 2 days a week. Run these longer distances when the rest of your life gives you time. They don't have to be on the same day every week. Between long days take short easy days.
Take at least one rest day each week. Rest on days when your schedule is most hectic. You can cross train on the days you don't run, but you don't have to. Cross training can be walking, swimming, bicycling, or any other aerobic activity.
You may or may not need speed work. If your only goal is to finish the distance and you don't care about the time, you don't need to do any speed work. Just run at a pace that allows comfortable conversation.
If you want a good or improved time, do some speed work. For unstructured speed work, run fast when you feel good. The fast runs should not be on your long run days. Instead run some of your shorter runs at a faster than normal speed. You can also do speed work by running short bursts, rather than an entire run, faster than normal. Do these fast intervals on days when you feel good. No more than about 10% of your total mileage should be speed work or races.
If you want a very fast competitive time, you should do regularly scheduled speed work for measured and timed intervals on a track rather than simply running fast when you feel good.
Taper. The last week or two before the race cut back on your mileage. Rest the last day or two before the race. Older runners need to taper more than younger runners. The taper insures that you are ready to go hard on race day.
Enjoy the race. Congratulations when you cross the finish line. Take a few easy days to recover afterwards.