The book is called "Fast after 50". No problem doing just sprints. Usian Bolt, the best known runner in the world, runs 100 meters in an event that takes him less than 10 seconds. Most people couldn't name this year's Ironman champion, over even know where that race takes place. Yet I would imagine Bolt probably trains harder than anyone on this forum. In triathlon, distance is the golden ring of achievement, it's an opposite mentality and is all about full ironman and Kona. Even 70.3 doesn't get that much respect. As my 13 yr old son says "It's only HALF Dad!" But a sprint is as tough as you want to make it - and you're no pussy, esp if you're hammering it. :)

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"The first virtue in a soldier is endurance of fatigue; courage is only the second virtue."
- Napoleon Bonaparte