I’m a 14 years old and my 5k pb is 18:17. On easy days I try to keep my heart rate under 155 bpm , I have worked that pace from 6:30 per km to 5:30 - 5:50/km. The paces feels easy but not jogging however the Daniels running formula would suggest that I run easy run at 4:34 to 5:10 /km. This just seems quite fast to me.
Is there a point , where you stop getting the benefits of an easy day, if so what pace is this?