How can barriers affect physical fitness?

Hmm.

Explanation:

'Your barriers to physical activity fall into one or more of seven categories: lack of time, social influences, lack of energy, lack of willpower, fear of injury, lack of skill, and lack of resources. A score of 5 or above in any category shows that this is an important barrier for you to overcome'

So basically, barriers affect physical fitness by literally not allowing you to exercise.

you would need to check her bp before and after her activity.