Don't waste your time and sweat for shredding cardboards specially the corrugated ones when using them for compost.
Corrugated cardboards are more effective to use rather than the usual cardboards. Try lasagna composting like what @fleurdelys mentioned. It's layering cardboards like in a giant lasagna casserole.
Cardboards are rich in carbon plus the oxygen that is trapped inside the corrugated paper make a good tandem for composting. Then add food wastes, leaves, manure, and other organic matter to make a healthier compost.
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