How often should you use deep, relaxing breathing techniques?
a. only during periods of stress
b. no more than twice a day
c. only when you've gotten enough sleep
d. every day

The answer is letter D.

Deep and relaxing breathing techniques contribute to a stable physical, emotional, mental, and spiritual development in individuals. Allotting at least 10 minutes of everyday to perform this method induces relaxation and improves focus in individuals. This practice allows the mind to get out of an anxious state and transition into a calm and peaceful one. Meditations paired with stretching exercises are also beneficial to overall health. The practice of yoga is known to address many physical ailments in the body as well as of the mind.

Yes she should but is this a question?

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)