Pressure Check

My friend Melissa takes a walk, goes by some firemen testing their equipment, and the result is a fascinating set of questions about life. (She's like that!) Get the context at her blog: QueenMAB Contemplates

What does it mean to do routine pressure checks?
If a particular hose can withstand 400 pounds of pressure, what is the equivalent for a human being?
How do we check our own pressure? (Is this called a "physical"?)
What is the equivalent of us laying ourselves out flat and running force through our bodies?
Do we swell and expand just like fire hoses? What do our hearts look like under pressure?
How does a mind or spirit expand or contract with pressure?
If we are in tune and can withstand such levels of pressure, what is our power in the face of fire?
Are our bodies capable of being conduits for water flow, a kind of saving energy?
As humans, do we have a routine way of doing this?
What happens if we aren't doing routine checks?
Is there any way we can make sure that we can withstand the fire, and be a positive force, rather than add to mess and damage?
What is it to be certain?