Rough Air Flying
Here in Aus we have some very rough air due high ambient temps, plus big thermals, and students find it very disconcerting.
I've found that it does help to show them how well you can 'quieten' the rough air by using rudder a bit more positively - via the secondary effect - rather than by overusing aileron, with the consequent yaw, and usually, tiring out from all the effort.
Once you get the hang of a slight 'lead' with rudder so that you are already picking up the down wing as aileron is applied, it does reduce the effort required.
Before everyone bags these suggestions, go and try them first.
Probably don't need to tell you that a few kts less IAS is a big help when instructing in rough air. Think in terms of perhaps 5-10kts less than the lowest Va, (as calculated according to average operating weight), for the type you operate).
happy days,