Do they have like wind element, or do they all just have one?
I think their techniques are just chakra manipulation, no specific element needed.
Rotation is just like Rasengan, spin with chakra to create an unstoppable force.
Air palm is chakra forced into a shockwave when it collides with the air.
And gentle fist works like Kabuto's chakra scalpel. Mold chakra into a sharp tool for piercing without cutting the skin. Onky difference is that they target chakra points and not organs. But the premise is basically the same.