Some ways are medical documentation or medical records. The purpose of medical documentation is to complete and precise patient record documentation is to foster value and stability of care. It creates a means of communication between providers and between providers and members about health status, preventive health services, treatment, planning, and delivery of care.
1.B without regular cardio workouts, you will have a very hard time breathing
2.B all of those CAN give accurate info, but gov. studies are best due to the amount of people they question
3.C the AHA does reliable experiments that proves helpful
4.D gov wellness sites usually give old or washed down advice
5.B if your muscles aren't used to physical activity, they will respond a bit more "aggressively" for lack of a better word
Since training and stretching for flexibility is a physical activity, I would say yes you should record it.