Modifiers matching exertion:

• physical,
• stressful,
• unnecessary,
• muscular,
• strenuous,
• heavy,

Simple categories matching unnecessary:

• treatment,
• activity,
• radiation,
• procedure,
• practice,
• information,
• surgery,
• therapy,
• measure,
• toy,
• task,
• exertion,
• misconception,
• thing,
• test,
• medication,
• interference,
• expense,
• service,
• intervention,
• stuff,