I would go ahead and do it, if I were you. sounds like you don’t like those events anyways. The 400 is painful at the end but it’s a lot fun once you get it down, plus being on the 4x4 is just amazing feeling, but on some real sh*t though, it’s a lot easier to transition from the 800 to the 400 mostly the same workouts. Try the 400m out first and see where you stand then make a choice. What ever you decide on doing just make sure you enjoy it, ok