* Marathon training then creates some significant opportunity costs for the triathlete looking to become a faster triathlete

1. At some point marathon training begins to compromise get-faster-on-the-bike training.
2. Marathon training, in my experience, is not the best and most time efficient tool to make someone a faster runner, to lift their VDot. Stronger, more durable, can go longer…yes…but for me that’s what we do in the last 16wks or so before an IM. Before that we focus on making you faster.
3. The net is that you don’t really get that much faster at either: your marathon training isn’t super great cuz you’ve still got your triathlete hat on = riding a bike, etc. And your bike doesn’t get much faster because you’re having to compromise your bike training because of all the marathon running you’re doing.