While a lot of people have thought up many excuses to get out of going to the gym, being allergic to it is probably not the normal go-to option.
Gemma Holtby is a former nurse who learned that she had a very rare disorder in a shocking way. She was going to the gym as so many people do, when she went to the washroom and realized her urine had turned black. Not only was her urine black, but her body seized up and she could not move.
She went to the hospital after a two weeks of being unable to move properly and was diagnosed with Very Long Chain ACYL COA Dehydrogenase Deficiency (VLCAD). Which essentially means that her body is unable to break down fat properly so anytime she exercises or gets stressed her body will target her muscles and destroy them.
There are usually other triggers that bring on symptoms.