Per Wilko:
Rolling is not so much about having a high center of gravity that needs
to be pulled out of the water by applying brute force on a paddle, but
more about using your hips and having the right technique.

In my brief rolling career, it seemed like there was also a component of
flexibility and cockpit design - at least for the rolls where the paddler lays
backwards.

Flexibility in that the paddler needs a certain amount of flexibility to lean
back like that.

Cockpit design in having the coaming low enough to allow one lay back flat on
the deck.
--
PeteCresswell