So here’s my problem. I plan to spend the next two weeks doing just easy pace mileage and strides. And then I will follow that up by doing tempo, fartlek and progression runs twice a week. My problem is that after I am having trouble figuring out which runs I should do after my base. Should I do longer interval type workouts like 1600, 1km repeats first, or should I do shorter workouts like 200s, etc or is a combination of the two best?