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.
Answer: C ; Explanation: if you’re increasing the duration of your working (the total time of your workout), you’re going to want to increase the time in each training session, which can be completed through increasing reps.
That is true
Hope this helps