Technology has experienced vast improvement(s) over the past decade. -- No; 'improvement' is fine there . -- Usually: 'Appearances are deceptive'.
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Mister MicawberNot really; we usually use 'exercise'. You must simply learn, case by case (as with protein and vitamins), which nouns are normally used countably and which uncountably. There are no rules; there are only general perceptions.How I wish that English was simpler!