Extreme 60-day home cardio program by Shaun T (Beachbody), max interval training pushing to exhaustion, pre-dated HIIT mainstream adoption.
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InsanityWorkout
Instagram 2009-01 health active
Updated 2026-02-17
Late 2000s Notable 6 million+ lifetime posts
First documented in January 2009 on Instagram. Currently active and in regular use across social platforms since 2009.
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