Convert 1 mm of hg into pascal. take density of hg= 13.6×10^3kg/m^3. g = 9.8m/s×s

1mm of hg pressure is supposed to be the extra pressured exerted by a column of mercury 1 mm high. 

So the weight of the column of mercury =  density * height * Area * g
               Area is the cross sectional area of the tube holding mercury.

Pressure exerted by this column =  Weight / area
             = density * height *  g
             = 13.6 * 10³ kg /m³ * 1* 10^-3 m * 9.81 m/sec²        
             = 133.416 Pascal  or Newton/meter²

 Height = 1mm (of mercury) column in the barometer.

All are great precautions but you can still lift lighter and different muscles in between hard workdays. this keeps other muscles not usually used in shape.

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