I would say that most / all would not reference training specific muscles fibers as the
reason for doing those
workouts — likely it would be explained in terms of VO2max, lactate threshold, running economy,
aerobic, and anaerobic.
In most cases, I recommend continued use of mobility work, yoga, easy «injury prevention» style
workouts, skills and drills to work on efficiency and economy or learning new exercises and movements, along with a general reduction in weights, sets, and reps, and a few
aerobic, fasted
workouts (the fasting for
reasons you'll discover later in this chapter).