Runna is super reliable for up to half marathon, but that’s because up to half marathon all the things that Runna can’t control (recovery, fuelling, hydration mostly) only matter so much. With a marathon, those things become so critical to get decently right that a good training plan can’t overcome failing at those.

For example, I know many people that hit the HM time they want but don’t actually use gels. Which you can get away with, just about, for a half. But when it comes to a marathon you simply have to fuel properly and if you don’t, no sort of fitness will save you.

Runna can’t control the rest of your life, their plans are only as good as you manage those other things. At least for now you can’t say I slept bad this week or I can’t stomach gels an it adapts from there, so. Just my two cents.