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There can be a myriad of reasons why you might lose run fitness: injury, loss of motivation, a planned break in training, a hectic work or family schedule that impedes your regular routine. Unfortunately, your physiology cares very little what the reason(s) might be, and the impact on your fitness is the same. That is, you’ll lose it. But it’s not all bad news—and it won’t all vanish overnight.
How Quickly do I Lose My Run Fitness?
Run fitness will typically drop by 2-3% each week that you’re not logging miles, but the process is more complicated than that. The process of losing fitness, sometimes referred to as “detraining,” can be divided into two phases: short-term and long-term, each having different impacts on your physiology and performance.
Certain adaptations, like blood volume increases, are fleeting, changing constantly throughout your training….
