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I reached the same conclusion for myself - that a ~40 minute cardio workout actually results in less productivity rather than more.

However, I switched to a 10 minute cycling workout with high intensity intervals (4-5 intervals 30 seconds in length). I have only done this for a few weeks, but I find that it boosts daily energy rather than depleting it.

[gt_]

Makes sense. I may give it a shot. I can have a hard time quitting sometimes. I can get uncharacteristically competitive with myself when exercising.