I started running ultras 2 years ago. Prior to that I had been doing regular morning runs for nearly 20 years and my typical daily mileage was 3mi; I felt great and woke up every morning refreshed. However, in order to run ultras, I had to increase my weekly mileage considerably, and ever since I have been having trouble recovering from my runs.
Basically, whenever I run 5 or more miles twice in a row, or 10 or more miles at once, my legs remain sore for the next 2-3 days even if I do not leave my home. In practice it means that I always feel sore and drained, and every time I get outside to run, I have to put in serious mental effort to get started, and the runs are not very enjoyable. A c