VERY broadly speaking, for a workout that falls into the “Productive” difficulty level, I tend to see the following:
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2 - Moderate = That was no big deal, I am ready for more than a “normal” step up in progression. Give me a larger adaptation than the typical +/-0.5 step (at least within my training history).
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3 - Hard = That was a good workout and felt “just right” in the fact that it was “hard enough”. Give me the “normal” progression bump of +/-0.5 step.
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4 - Very Hard = That was possible, but took more from me than I’d want for a “good/hard” workout. Limit any increase or even stall with no Progression Level increase on pending workout(s), because I need another shot at this challenging level.