I've been doing rolls on harder surfaces (such as non-carpeted floors and concrete) from time to time, and the thing that causes me to go ouch most often, is... the belt I wear around my pants/jeans/whatever it is at the moment !
The pain comes from it pressing against my kidney(s) at the point in time when that point of my back makes contact with the surface...
Has anyone else experienced this ? I'm curious...
I guess in the proper roll, only the arms make contact with the surface, eh ?
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