Whynnnn wrote:
Why not infinity threshold ?
There is a real question buried in there. The two extremes of a training day would be a very big single threshold and a large number of very small threshold workouts. Something like 10-15x mile at threshold as a very large single workout could be replaced with 10-15 individual threshold miles.
A lot of triathletes don't do triple threshold workouts, but do a double threshold with an easier workout in between..