So, if the second run enhances recovery, even when fatigued from a previous run, how many runs should I do in a day before I physically feel like I haven't run at all?
I love this sentence: "Research looking into training twice a day versus once a day for the same total weekly volume has shown that the increases in aerobic enzymes (proteins that facilitate energy production) can be potentially greater when doing two bouts of exercise relatively close together." It's been shown to possibly have the potential! That's genuinely nearly a fact, almost!
There are plenty of good reasons for doing doubles, not only because your spouse has demanded you wash twice a day. Dual stimulus sessions in a day, shorter runs can be harder, reducing glycogen depletion for harder later sessions, time management, morning runs on empty... It would be nice if a plan was backed up with latest theory, rather than a suggestion backed up by pseudoscience and anecdote.
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