Originally Posted by
andy k
Anyone I've ever spoken to or anything I've ever read says that the key to good Endurance running is to do plenty of running at race pace, not all your running, but a decent bit.
One approach that I have found really effective in developing race endurance is to embed a tempo session within a longer run.
example - based on your 3 hour target
your weekly long run might be 2hrs 15mins (3/4 of race)
spend the first 45 minutes running easy, warming up
spend the middle 45 minutes at your target race pace (or effort)
spend the last 45 minutes running steady (which will feel easy relative to race pace)