Been running for six years, past nine months have done workouts perhaps once every 10 days or less. Strides/sprints once a week. Didn't used to always train like this. I am much faster now than I was before. 400 speed is quicker, and hour long tempos are at my previous 10k pace. Mileage is moderate, 60-70 most weeks. What's the deal here? Do you not need workouts often to be fast?
400 then vs now: 52-49
10k pace was 4:58, now that is extended tempo pace.