YES! The PC muscles are the biggest contributor!

So, today was a GREAT day. Focused solely on using my PC muscles and limiting rectal muscle usage as much as possible. What a freakin’ difference! Surprised how sore I am after an hour today and what I did yesterday. Been working out the wrong muscles for weeks! Time for some kegels!

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Source: https://www.aneros.com/blogs/yes-the-pc-muscles-are-the-biggest-contributor/