[rdmsr]

Not sure what is meant by that commenter, but weight loss and strength gains are common goals which running isn't the most efficient at achieving. Obviously, it still impacts these and, obviously, those aren't goals for everyone.

Running is great at improving cardiovascular output (honestly not sure how it compares to biking and swimming), but that isn't all of fitness.

[auxym]

According to this [1], running is much more efficient at improving cardiovascular endurance than biking, in terms of time spent training for a particular gain. Particularly trail running.

[1] https://www.amazon.com/Training-New-Alpinism-Climber-Athlete...

(ps. As someone who is sort of a weekend outdoors entusiast, without being any kind of a competitive climber or particularly interested in training, I thought it was an interesting read and would recommend.

[rdmsr]

It's a solid book, although I don't recall the bit that you're citing. I didn't read it that thoroughly. Started it and realized that I'd rather work towards 5.13 than the summit of Everest/Denali/whatever.