Possible Clues:

• Treatment using massage or exercise (colloq.)
• One's paid to manhandle reportedly gassy oxygen
• Member of medical team sounding bubbly at start of operation
• Masseur (abbr.)
• Benchwarmer perhaps recognises the strain on others
• Is often looking for a break as won't rub someone up the wrong way?
• Therapy with effervescent sounding ring to it
• Cry out of hypocrisy with one of those having to deal with the strain
• Practitioner of massage and exercise treatments
• Exercise therapist