Ok for those with a good run base?

Possibly.

Many/Most triathletes grossly underestimate their run fitness.

So, I'm making a generalization here, but most would benefit from this.

The questions are, where are you know, and where do you want to go? No matter where you are, you can always make the run base deeper and broader, which is never a bad thing.

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Steve Fleck @stevefleck | Blog