Insanity vs P90X
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description Overview
Insanity
Created by Shaun T and released in 2009, Insanity is a notable 60-day home workout regimen famous for its grueling max-interval training that requires no additional equipment.
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P90X
P90X is a popular 90-day extreme home fitness program created by Tony Horton in 2003 that popularized the concept of muscle confusion through intense cross-training workouts.
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