Let's say that my body is conditioned to running 50 miles per week, with a typical mixture of easy runs, long runs, tempo, intervals, etc.
Let's say that my race pace is 10k in 38 minutes.
Now, for various reasons, I can only do 4 runs per week for a total of 3 hours.
Given these circumstances, I want to maintain my body's ability to absorb many miles per week, and maximize my race pace at 10k.
What is the best strategy, and why?
I presume that I want to keep a mixture of run types / distances, but would I really want to keep such a high portion of easy / comfortable runs? Why shouldn't I do every single workout (close to) as fast/hard as I can? People are telling me it'll lead to injury, but my body is used to 50 miles per week, and with 3 hours total I won't even hit 30 miles. Does maximum exertion really increase the risk of injury that much?