[TheCaptain4815]

I do kind of the opposite and focus on 2-3 sets of 500m as hard as possible (with perfect form of course). My average is around 2:04, and the difference between that and even 2:14 is incredible. I could go for 1,000+m easily at a 2:14 pace but feel like I'm about to collapse after a single 2:04 set... It's helped me stay in incredible cardio shape and has built a lot of my leg muscle.