Disorders are psychological difficulties that take on a physical form, but for which there is no medical cause.

Somatic disorders are psychological difficulties that take on a physical form but for which there is no medical cause. 

These disorders indeed represent an interesting family of disorders which have very varied symptoms and can play out differently in each individual. 

Ithink it would be a and b

Dbecause it isn't always an athlete, breathing techniques don't have to be advanced, and consistent intensity won't make it go down or stay the same