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Squaredisk
About 30 years ago me and a mate used to do a (Cambridgeshire) hilly 30 mile circuit without saddles/seatposts every fortnight or so. That was a hell of a workout for the legs. No sitting on the top-tube either.
Reminds me of the "Slow Motion" Zwift workouts where you grind out intervals of 6 minutes at 70% FTP, 4 minutes at 90% FTP and 3 minutes at 110% FTP all at 55 rpm.