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by crimsonalucard 2331 days ago
A lot of training regimes are used because they are effective but not scientifically proven to be the best possible training method. I'm guessing that the examples you are talking about used training methods that were effective but not the scientifically verified to be optimal. It's possible these athletes may have hit their maximum potential but had to do way more training than necessary.

It is scientifically verified that HIIT counterintuitively effects the aerobic signaling pathway at a greater rate than aerobic exercise itself. My other comment in this thread cites tons of good sources:

https://news.ycombinator.com/item?id=22157311