Question: how to get 5k under 20 minutes?
Answer: Sunday 20 minute tempo run at 6:50–7:00 minutes per mile. A 20 minute tempo run should be at a pace you can hold for about an hour. To get that pace you add 20–30 seconds per mile to your 5k pace. So, 20 minute 5k pace is 6:26 per mile so about you should be running about 7:00 pace on these tempo runs.