Most solid training plans include a weekly speed workout, often in the form of intervals. But the length of those intervals usually depends on your race distance, training goals, and fitness level.

Long runs are an essential part of any race-training plan, whether you’re prepping for your first 5K or your tenth marathon. The distance you rack up during these sessions may become daunting, but ...

What was your longest run in the previous month? Why did you run that far? You might answer these questions by pointing to where you are in a buildup to a key race. But take a step back: Why that ...