Prefacing this post by stating ‘sweet spots’ doesn’t really exist in live rolling as unless your training partner is completely gassed or passed out, there’s going to be degrees of movement/counter-movement.
For educational purposes though, studying the idea of sweet spots is invaluable. ‘Sweet spot’ as defined here is the ideal amount of tension in a given position.
If you’re too stiff for example, you’re probably easy to move in a least one direction, not contoured/molded to maximize surface area, won’t be able to counter-move effectively, nor be energy-efficient.
Too loose via dead body-weight will enable initial heaviness like a wet blanket but eventually you’ll lose the connection.
What we’re looking for is balance, so imagine positions in space. Where does it give and where is it strong and why?
Related post (Indentifying Static And Dynamic Components): https://structureofgrace.wordpress.com/2014/01/10/identifying-static-and-dynamic-components/