All aerobatic pilots are aware of metal fatigue so this is just some additional information on some practical aspects of fatigue management.
Pilots of Airtourers, CT-4's and Zlins would be aware of safe lives - throw the airframe away once its got that many hours.
Decathlon pilots should be aware of a need to record time doing aerobatics. One Airworthiness Directive which requires this is AD/CHA/15:
"Retire the wing front strut assembly ... from service ... before achieving 1100 aerobatic flying hours. Note: The hours are those actually spent in aerobatic flight and do not include positioning time."
That is a very specific statement worth repeating and considering what it means - time actually spent in aerobatic flight. It does not include time spent climbing between aerobatic manouvres nor time spent letting your stomach recover nor time spent pottering along looking for other traffic. Aerobatic flight means aerobatic flight, a specific definition which does not include flying straight and level or medium turns or climbing and descending. So, if you spend an hour in the aeroplane from Moorabbin you are likely to spend only 0.1 or 0.2 hrs actually in aerobatic flight. To record an hour of aerobatic flight results in needlessly throwing away an expensive strut long before it needs to be.
More later .....