1)
Overload PrincipleTo make improvements in your fitness you need to overload your body. You need to stress or challenge the bodily system (aerobic/musculoskeletal) beyond what it is used to.
2) Specificity Principle
Your exercise program must be specifically related to your training goals.
3)
Individuality Principle
"Everyone is different, which means everyone is special)
4) Reversibility Principle
Not being as good as something as you used to.
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All of them could be intentional/unpreventable, we are only talking about an injury so I would say the plane crash.
Well if you want you can call the police but I think you should go to a therapist and be open about what happened
That's history not health