There’s a right way and a wrong way to do anything.

I sit in on my son’s violin lessons and take notes for him, Suzuki Class style.  The last two lessons have mostly been about him correcting some posture habits that, if successful, will allow him to relax his left thumb just that little bit and thus result in a bigger, cleaner sound.  Who’d have thought that the way you hold your opposite shoulder and bend your opposite elbow would eventually cause you to over-extend your thumb and mess up the tone of your playing?

Likewise with kayaking.  Who’d have thought that hanging upside down and banging your head on the rocks as you pass wrong-way-up through a rapid could have an adverse effect on the way you hold your shoulders?

I may have had some elements of that last part transposed.