You`re feeling stiff,  maybe a little tense and you`re picking up a parcel from the floor.  Emergency !

I`m stuck!  What do I do?

(a)               (b)

(c)               (d)

(e)               (f)

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You are bending down to pick up a parcel from the floor. Suddenly, you are in excruciating pain. You cannot move (see a and b)
So:

1. Don`t panic.
   The cause most probably is the muscle having gone into acute spasm  because it was already tense due to Body Language resulting from stress.
    
2. If there is no handy chair or ledge to lean on, put  your hands on the front of your thighs, and take the weight through  them. (see c)
    
3. Stand still. Breathe gently and rhythmically with the diaphragm. Don`t hold  your breath. Just wait until the acute muscle spasm wanes, as wane it will.
    
4. When you feel able, walk the hands up the thighs (see d)
      
5. When you feel able, bend the knees. This will bring the spine into a more vertical position (see e) 
    
6. Straighten the knees (see f)

Breathe in, breathe out, breathe in, breathe out, gently and rhythmically, all the time!