Keeping tabs on your exercise and eating habits can drastically change your lifestyle and for the better. When you have a journal you feel more motivated and in the end, you will not only eat healthier and exercise more often/vigorously, but you feel better.
So basically it keeps you motivated because you keep all of your physical data in one place.
The answer to your question should be option "b".
Answer : Writing is a skill, it has to be different while dealing with team of professional and patients. While dealing with the team of professionals one can use short forms, jargons, etc. with a formal writing style along with the required details.
Whereas when writing for patients they have to be clear, clean in handwriting and should be able to convey important information related to patients. They cannot use their short forms or jargons or technical terms for the patients.
Wearing and properly using safety equipment does reduces the risk of injury during a physical activity. so its true