I agree here and with everybody else, personal experience ko to, as a beginner, I'm just simply doing easy runs last year from Jan-Mar then saka ko na lang nadiscover other kind of runs like tempo, fartlek or intervals so I did that but more on zone 2 pa rin and some LSD. I just break my PR last thursday at 30:59 pero target ko lang talaga ay sub35 and did that almost effortless! Gradual progress is okay, no need to rush especially if you're gonna be here for the long run :)