I just found out about P90x and it seems they use the muscle confusion theory. But how does it work neurologically and as far as creating muscle mass is concerned? What would a typical routine be? Examples please.

Thank you.

  • 8
    Is "not terribly well" a valid answer? Commented Jul 30, 2014 at 23:18
  • Point to the cognitive (thinking) part of a muscle that can get confused. No? There's your answer.
    – JohnP
    Commented Jul 31, 2014 at 15:06
  • Start telling your quads a riddle.
    – Eric
    Commented Mar 26, 2015 at 22:07

1 Answer 1


The phrase is a marketing slogan.

That said, it is based on the principle that if you do the same thing time and time again, your gains will plateau at some point. By varying what you are doing and targeting the muscles in different ways, it will take your body longer to "get used" to a particular routine/exercise, which results in plateauing.

  • 1
    Although, that said, it's got less to do with physicality and more to do with psychology.
    – Sean Duggan
    Commented Mar 26, 2015 at 20:37

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