In the article that I wrote about air sickness, I stressed that the best way to prevent air sickness is to focus outside on the horizon. In fact, focusing on the horizon is the primary key to performing aerobatics with precision as every one of my students will attest. I always take a few minutes before each lesson to emphasize the importance of focusing on the horizon. I also make the student aware of where the horizon is in any given maneuver. Remember, the best horizon isn't always directly over the nose in aerobatic flight.
Aerobatics is unlike any other form of flying that todays average pilot has performed.
The FAA in their infinite wisdom has encouraged an instructional technique called composite learning. Unfortunately too many instructors have blindly accepted this technique. Probably because they didn't learn to fly by the composite flight training method. The FAA determined that the vast majority of crashes by private pilots are from inadvertant flight into Instrument Meterological conditions. So, in an effort to reduce this scenario, the FAA has encouraged flight instructors to teach Private Pilot students an increased amount of flight training by reference to instruments.