Puberty, and there are many websites and books that offer information so you know what to expect.
The answer would be B. Only during periods of stress. When you are stressed out you are most likely having a hard time relaxing. If you take deep breaths your breathing should slow down and your body will relax. D. Only when you've gotten enough sleep, has nothing to do with breathing, you don't need to take deep breaths after sleeping. C. No more than twice a day and A. Everyday, are both unnecessary, you don't need to take deep breaths everyday for no reason. Stress is the main reason people hyperventilate. They get stressed and they have varied symptoms. They can't breathe, have short amount of patience, etc. <span />
Could you elaborate more please? (:
The right answer is isometric
The word isometric is an adjective of Greek origin (the prefix iso- means equal and metric means metron means measure)
Isometric force is a muscular contraction without shortening where the two points of attachment of the muscle are fixed, contrary to the concentric and eccentric work. A muscle subject to isometric contraction is a muscle that works in tension but without movement.
The main answer would be C, it could be a depending on how intense your workout is
