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.
The main risks of being unprotected from the sun is sunburn, skin cancer, skin damage, and premature aging could be effects of being exposed to the suns UV rays
Probably blood clots such as bruises.
